Jack giggled hysterically in his father's arms, hanging upside down as they spun around in the backyard. Erica ran around them, trying to keep up as she laughed along. It was a simple game to keep the two six-year-olds entertained on a Saturday. "Go faster, Daddy!"

"Faster? If you say so," Chandler said. He spun around faster, listening to his kids giggling which was his favorite sound. Playing with the kids was something Chandler never wanted to take for granted. Maybe it was because he never had someone to play with as a kid. Chandler always dropped everything to be with them. They always had an active imagination and loved playing the games they came up with.

However, running around with the kids all the time has had its effects. He wasn't exactly getting any younger. Even if he had the energy to keep up with them, games like this made his back hurt. Eventually, he held Jack tighter against his chest and pretended to crash land on the grass.

He lay down on the ground with a slight groan as the twins squealed in delight. "How 'bout a new game where I can lay down?"

"Let's play doctor!" Erica smiled.

"Yes!" Jack nodded and grabbed Chandler's hand. "Daddy, you have to come check into the hospital! It's urgent!"

Chandler grunted softly as he got up, letting Jack lead him back into the house. He watched Erica run ahead of them, presumably to set up their hospital game. When they went upstairs to the kids' playroom, he was led to the white couch on the far wall.

Since moving to a new house, Monica took the chance to get new furniture. Instead of getting rid of the couch from the apartment, they had put it in the playroom. It was a simple way of keeping most of their toys in a contained area.

"Please lay down here," Jack instructed.

"Thanks, doctor," Chandler said as he lay down on the couch.

Jack shook his head quickly, "No, I'm the nurse!"

"Oh sorry. Thanks, nurse. My name is Fredrick," he said, playing along.

Jack giggled at the made-up name and went over to the shelves of their toys. His eyes scanned across the neatly made labels then pulled out the box that read 'Doctor's toys'. When he found what he was looking for, Jack returned to the couch and stuck the plastic thermometer in Chandler's mouth. "Don't worry Fredrick, we're going to make you all better."

"Oh good," Chandler sighed, making a point to visibly relax his shoulders. "I trust you."

"Hello!" Erica shouted when she walked in, now with a plastic stethoscope around her neck. She held her hands behind her back, moving next to Chandler. "I'm the doctor."

Before he could say anything, Erica poked his arm with a fake needle. Chandler figured it was meant to be a shot so he rubbed the area with a slight pout on his lips. "Ouch!"

Erica quickly pulled a band-aid out of her pocket and handed it to Jack who was quick to stick it on his arm. The boy gently patted his father's shoulder for comfort. "You're very brave."

"Now, what's wrong?"

"Aren't you supposed to ask that before giving me a shot?" He asked.

"Maybe, but I'm very busy right now," Erica said with an eye roll. "What's going on with you?"

Chandler hummed and patted his stomach. Even though it was his back that was sore, there was nothing they could do. Instead, he came up with an easy problem to deal with. "Well, my tummy hurts. What do you think it could be, doctor?"

She moved the stethoscope up to her ears and grabbed the end to put on his stomach. "I think you might have a baby. We need X-rays!"

"I don't think that's possible," Chandler muttered.

" I'm the doctor. Nurse, can you do the X-ray on this man for me?" Erica turned to her brother, who nodded quickly and ran off to grab something else. She poked Chandler with the plastic needle again and threw another band-aid onto his chest, "Goodbye!"

He watched his daughter move to another side of the room, lining up stuffed animals and listening to their hearts. When Jack came back with a shoebox, Chandler grabbed the band-aid. "She gave me another shot, I need your assistance."

Jack gasped softly and put the box down to put the band-aid on his arm. It was nowhere near where Erica had poked him, but it didn't really matter. He reached up and patted the top of Chandler's head. "Don't worry, it's all to help you get better. Now, time for your X-ray."

The boy picked up the shoebox and hovered it over his father, making noises with his mouth as he moved the box back and forth. "X-ray done! Your results will be ready soon!"

Chandler kept his eyes on Jack when he ran across the room to the small table covered in paper and crayons. When he started to color, Erica came back and poked him again. She giggled while putting the third band-aid on him.

"Here's your X-ray doctor!" Jack rushed over with a piece of paper that had a simple drawing of what was supposed to be Chandler.

Erica took the paper and looked at it closely. "Oh dear, this does not look good."

"What? What is it?"

She held the paper up, showing a poorly done drawing of a cat in Chandler's stomach. "You have an opossum in your belly."

"That's not an opossum!" Jack protested. "It's a cat."

"Oh, yes. A cat in your belly," she corrected. "We're going to need to do surgery to get it out."

"How did a cat get in my belly?" Chandler asked.

Jack looked at him with concern in his eyes, "Did you eat one?"

"No," he shook his head.

Erica put the drawing down and shook her head. "No one really knows how this happens. Our working theory is that it crawled in through your belly button. This usually happens in your sleep. That's why you didn't see it before," she poked his belly.

"We have to cut him open! Nurse, get the tools." Erica went to her stuffed animals to grab the ones she wanted while Jack went back to the box of doctors' toys.

Chandler closed his eyes, taking the moment to relax even if it didn't last very long.

"We're back!" Erica shouted, stuffing the animals she grabbed between him and the couch. She held out her hand toward her brother, "Nurse! I need the knife."

Jack handed her a plastic toy knife and smiled at his father. "We're going to make it better. Don't be scared."

"Aren't you supposed to put me to sleep before you cut me open?" Chandler looked between them.

"Yes! Nurse, put the man to sleep, please." Erica waited as Jack put a blanket over Chandler's eyes and stroked his head.

"Go to sleep. Go to sleep," Jack sang softly until his father's eyes closed. He looked at his sister and whispered, "He's asleep now."

She nodded, poked him with the fake needle on his cheek, and then handed Jack a band-aid. As he placed the bandage on their father's face, she moved the knife across his stomach. "Let's get this cat out!"

Erica reached over him, digging through the stuffed animals and the couch cousins to pretend like it was his insides. She felt something soft, so she pulled it up, pretending to struggle. "I think I got it!"

With a soft grunt, she pulled up a stuffed giraffe by its leg.

"That's not a cat," Jack pointed out and looked at the X-ray again. "I think that's supposed to be there. Put it back!"

She gasped softly and tried to stuff the giraffe back where she grabbed it. "It's not working! I need something to whack it with," she squealed in a panic.

He grabbed the inflatable hammer and handed it over to her. "You have to fix him!"

Erica started to hit Chandler with the toy, a squeak coming from the hammer with every hit. Desperately she pushed the giraffe toy down with her hands, shoving it into the couch. "Wait, I think I see the cat!"

"Grab it quickly!" Jack started to jump up and down in anticipation.

Pretending to struggle again, Erica attempted to pull it up, and then she screamed.

"What happened?" Her brother leaned closer to her as she pulled her arms back.

"It bit me!" She grabbed a new band-aid from her pocket and then handed it to Jack so he could put it in her hand. "It's not going to budge. We have to wake him up and tell him the news."

Jack frowned at his feet. "You mean, we can't make it better?"

"Nope," Erica said confidently. She grabbed the hammer again and whacked his head after she took off the blanket. "Wake up!"

Chandler tried his best to contain his laughter at their imaginations as he opened his eyes. "Is the surgery done already?"

"Yes sir. We're sorry to tell you, but we can't get the cat out. Good luck. I have other patients to get to," she said urgently. Erica returned to the now smaller row of stuffed animals to play doctor on them instead.

"Oh, man. I really thought I was going to get better," Chandler sighed.

"I'm sorry Fredrick," Jack muttered solemnly.

He gently grabbed his son's hand, "It's okay. You did your best and that's what's important. I appreciate your efforts."

Jack looked at their hands and felt a new surge of determination. He grabbed the X-ray off the floor, "Maybe there's something I can do."

The boy went back over to his table and started to scribble again. When the new picture was satisfactory for him, he went over to Erica. "Excuse me, doctor."

"I'm a little busy here, nurse," she said, putting the stethoscope up to a stuffed dog.

He looked down at the paper and tapped her shoulder. "You might want to look closer at this X-ray. It's important."

"Is this about the man with the cat?" Erica took the paper to see the new drawing. She gasped softly when she saw something new on the paper then ran over to their father. "Hello, again sir!"

"His name is Fredrick," Jack huffed slightly.

She held the drawing up so he could see it. "Fredrick. There's something that we missed before. See? There's a raccoon in your tummy too."

"It's not a raccoon, it's a mouse." The little boy crossed his arms with a small frown.

"Mouse," she corrected quickly. "You must have swallowed a mouse in your sleep!"

"Yeah! And the cat followed it because cats chase mice all the time!" Jack smiled at his sister who nodded in agreement.

Erica moved closer to Chandler, putting the end of the stethoscope on his forehead. "Yes. I know what we need to do. We have to trick the mouse to come out with a piece of cheese and the cat will follow. Nurse! Go get cheese for us please!"

Jack dashed out of the room, heading to the kitchen. While he was gone, Erica poked him in various places with the plastic needle as an excuse to cover him in band-aids. His arms were almost covered, plus a few on his face by the time Jack got back with a piece of cheese. "I got it!"

They both crowded around him, holding the piece of cheese over his face. Chandler opened his mouth for them to believe the mouse could escape. Erica started to dig behind him again and grabbed a rubber rat. She threw it up in the air like it was jumping out of Chandler's mouth with a small giggle. "There's the mouse!"

"And the cat!" Erica grabbed the toy cat next and threw it. She hovered over him, her face above his, "You're healed! How do you feel?"

"Much better, thank you, doctor. And thank you, nurse."

"Yay!" The kids cheered together.

"Honey! I'm home," Monica followed the sound of their voices into the playroom. She stopped in the doorway when she caught sight of her husband lying on the couch covered in bandages. Covering her mouth with her hand, she started to chuckle. "Oh my gosh, what happened here?"

"We're helping Daddy feel better," Jack smiled.

Chandler got up to greet his wife, but the twins latched onto his legs, making it harder to walk.

"You can't move, you're in recovery!" Erica giggled.

"Argh!" He grunted with each step until he made it in front of Monica. "Hi."

Monica wrapped her arms around his neck, still laughing at the band-aids all over his face. "Hi. What's going on?"

"Oh, nothing." Chandler looked down at the twins hugging his legs tightly while sitting on his feet. "We were just playing doctor."