"So, Ferb, what do you want to do today?" Phineas asked Ferb as they leaned up against their tree.

Rather than use words, Ferb simply shrugged in response to his step-brother's question.

"What about Perry, what does he want to do today?" Phineas asked their pet who simply chattered in response. "Well, he's a platypus, they don't do much. I for one, am starting to get bored, and boredom is something of up with which I will not put! The first thing they're gonna ask us when we get back to school is "what did we do over the summer?". I mean, no school for three months. Our life should be a roller coaster! And I mean a good roller coaster, not like that one we rode at the state fair."

After flashing back to the lame rollercoaster Phineas spoke up again. "Man that was lame. Why, if I built a rollercoaster, I would... That's it! I know what we're going to do today!"

"Phineas, Ferb. I'm gonna pick up a few things. You boys stays out of trouble, okay?" Their mom said as she walked out of the house.

"Okay mom." Phineas said as she exited the backyard. "We're gonna build a rollercoaster!"

Meanwhile outside of the backyard

"I'm in charge, right? You did tell them I'm in charge?" Candace questioned her mom as she climbed into the car.

"Relax, Candace, nobody has to be in charge." Linda responded.

"What if a... What if a satellite falls out of orbit and crashes into the house?" Candace asked flashing her mom a smile.

"If that happens, you're in charge." Linda responded closing her door. As the car pulled away Candace punched the air with a "Yes!"

"Mom says I'm in charge… conditionally." Candace says to her brothers as she enters the backyard.

"Whatever." Phineas responded writing on something on a desk.

"Wait a minute, what are you doing?" Candace asked pointing a finger at them.

"Homework." Phineas responded not looking up from his desk.

"It's Summer."

"That's cool, you wait till the last minute then."

"Well I'm watching you." Candace said entering the house. "And I'm in charge conditionally!"

Just as she entered the house the home phone rang. "Hello? Oh, hi, Stacy! No, I can't get to the mall right now. Mom just went to the store, she left me in charge, well, you know, conditionally. And if you go, can you see if Jeremy is there? No, no, he's the cute one that works at Mr. Slushy Burger. Yeah, he totally smiled at me the last time I was there. I just about died. No, I told you I can't, I'm watching my brother and step-brother." For some reason a lion roared outside interrupting her conversation. "Will you hold it down, I am trying to use the phone! Mom left me in charge, so I need to stay home today. What are they doing right now? Why do you ask? What do you mean you can see it from your house? See what?!"

"Phineas, what is this!?" Candace shouted as she ran into the backyard and saw what they were really doing.

"Do you like it?" Phineas asked from on top of the hill.

"No, I don't like it! It's dangerous and looks very expensive!" Candace said concern all over her face and in her voice.

"Don't worry Candace, me and Ferb have the costs covered and all the carts will have seatbelts." Phineas said dispelling some of his sister's worries.

"How are you covering all the costs of a rollercoaster?!" Candace asked/yelled.

"Ferb offered to teach the CEO of a steel company classical guitar and the owner of a woodwork factory's daughter how to win debates." Phineas answered to which Ferb gave a thumbs up.

"Oh, well in that case have fun!" Candace said smiling and giving her brothers a wave before entering the house.

"We're gonna need a blowtorch and some more peanut butter." Phineas said as his sister closed the door.

Then they finished the rollercoaster, rode it, and landed in the backyard a few minutes before their mom came home. When Linda entered the house she saw Phineas, Ferb, and Candace sitting on the couch together watching TV.

"Candace, I am very impressed. Not a single phone call." Linda said as she entered the kitchen.

"Well when you have brothers as awesome and easy as these guys there's no need for a phone call." Candace said before her face contorted into one of slight disgust. "That came out wrong didn't it?"

"Why, yes, yes it did." Ferb responded.