Author's Note: :D
Disclaimer: Alex Hirsch owns Gravity Falls and everything related to Gravity Falls. Oh and LMFAO owns the song and copyright.
Requested by: TheKawaiifan
'Dipper was on a step stool hanging up some streamers.
"Hey Mabel, can you hand me some more streamers?"
She looked in the box of supplies. "We don't have anymore."
The boy stepped down from the ladder and looked at Mabel.
"What do you mean there's no more? I just bought three whole rolls of streamer yesterday!"
The two looked in the box and there was nothing left.
"Mabel. Did you do something to them?"
"NO! Absolutely not! I was just blowing up the balloons and I ran out!"
Dipper thought and then looked around. Hmm...where could it be?
Out of the corner of his eye, he saw a bright neon green streamer near the door. He walked over there and opened the door.
There was a trail of streamers, balloons, glitter, and party signs making a trail that led to the forest.
The boy grabbed the empty box and followed the trail. Mabel followed behind Dipper.
As the trail got shorter, a sound got louder.
The twins got closer and closer to the sound. It sounded like it had a beat.
Eventually, the trail started to have bits of candy in it.
They got closer and closer until... "Slenderman?!"
In front of them was Slenderman and a pile of candy dancing to LMFAO's Party Rock Anthem.
Slenderman was shuffling and the candy pile was moving.
The two creatures were having a miniature party with the stolen decorations.'
That was when Waddles woke up to a fully decorated Mystery Shack.
"Hi Waddles!" Mabel petted her pig and then continued to help her brother decorate.
Waddles fell back asleep.
Author's Note: Sorry the stories are getting shorter and they're starting to suck.