Make a detailed story about Shrek in the nude (describe his butt throughout the story) in his swamp. He has to fart, and is walking to a pond before it comes out so he can kill some fish with it for a snack. He wades into the water waist-deep, grinning as he farts. Some fish die from the stink (describe what body part of Shrek they surface near), and Shrek happily devours them