Late at night at the Mystery Shack, everyone was getting it set up for a party of some kind. Soos was placing party hats on the rhino's horn, Andrew was setting up a DJ and boombox, Wendy was making balloons, and Stan and Skyla were making sure everything was in order.

The triplets and Gary however were sitting on the couch, just hanging out.

"Ugh…" Dipper groaned, "You guys, I don't feel so good I-I-"

Dipper sprayed some silly string on Mabel, and Mira, as he had pretended to throw up. "Agh, Grunkle Stan, what did you feed us?" Mabel asked before she sprayed some silly string on Gary and Dipper as she pretended to throw up.

"Guys, I think I'm gonna-" Mira said before pretending to throw up, spraying the silly string on her brother and sister and cousin.

"Oh my gosh, it's-it's-" Gary said, as he pretended to throw up and sprayed the silly string at the triplets. The kids continued to spray each other with silly string as they all pretended to throw up until-

"You guys! Stop everything!" Andrew said.

"Something awful just happened!" Wendy said.

The kids looked at one another, but than Andrew and Wendy surprised them all when they started to spray silly string on them as they started to laugh. "PARTY SUPPLY FIGHT!" Gary shouted. They all grabbed confetti guns and more cans of silly string and started to fire at one another as they laughed. Though Stan had gotten fed up with this and just snatched the supplies out of their hands.

"Alright, that's it, party supplies are now off-limits." Stan said, putting them back where they had found them. The kids couldn't help but groan at this.

"Don't give him that look." Skyla said to them, "You bought that upon yourselves."

Soos had asked both Stan and Skyla, "Mister and miss Pines, whose birthday is it again?"

"It's nobody's." Skyla replied, "Dad and I thought that this would be a good way to get kids to spend money at the Mystery Shack."

"These kids want fun? I'll smother them with fun!" Stan said.

"Nice!" Soos said with his thumbs up.

Dipper went to go get a cup of soda for himself and his sisters, "Maybe it's comments like that why kids avoid coming to the Mystery Shack." He handed the cups of soda to Mabel and Mira, though before Dipper could pour himself a drink, Stan took the bottle of soda out of his hand.

"Hey, how about you make yourselves useful and go copy these flyers?" Stan said, handing Dipper the flyer for the party.

"Oh boy! A trip to the copier store!" Mabel said.

"I've always wanted to see this town's copier store!" Mira said.

"Calendars, mugs, t-shirts and more, they got it all at the copier store!" Soos said, "That's not their slogan, that's just how I feel at the copier store."

"Well you can save the trouble." Skyla said, "You know that old copier machine in your Grunkles office. He finally got the old thing fixed and it's as good as new. You can just use that to copy the fliers from there."

The triplets went straight to Stan's office and found the copier machine. Dipper peeled off the old sheet only to find that the copier machine was old and all busted up. Not to mention they were several moths flying from it and it was covered in cobwebs and dust.

"Ooo, butterflies!" Mabel said with a smile.

"Those are moths Mabel." Mira said to her.

Dipper lifted the lid, "Does this thing even work?"

"Let's find out." Mira said. She went ahead to press a button on the machine though nothing seemed to have happened. Dipper rested his arm on the machine, and that's when it suddenly turned on, and scanned his arm, making a copy. Mabel took the paper as soon as it was printed.

"Success!" She said.

Suddenly the paper had started to wiggle and move, causing Mabel to drop it; Dipper and Mira jumped at the sight of this. They had gotten even more scared when they saw that Dipper's copy arm actually come out of the paper, and crawl towards.

"AH!" Mira exclaimed, "IT'S ALIVE!"

Dipper grabbed Mira's soda. "STAY BACK!" He shouted as he tossed the soda onto the arm. The minute the soda landed on the copy arm it had disintegrated into a puddle.

"Oh my gosh!" Mira said, "What was that?!"

"Mabel, Mira…" Dipper said to his siblings, "... I think this machine, CAN COPY HUMAN BEINGS!"

Mabel and Mira gasped in horror at this. "Do you realize what this means?" Mabel said. Though neither of them didn't have time to answer when Mabel pretended to throw up as she sprayed silly string on both of her siblings faces.