Naked Ass Fart
They drop their pants like they're about to get a spanking, spread their butt cheeks like a magician revealing a rabbit, and let out a fart so strong it could knock someone out.
My friend did this in the middle of a basketball game and got substituted out.
I did this during a sleepover and my brother laughed so hard he spilled his juice.
My cousin did this at a birthday party and the cake got ruined.