It was especially fun scooping this... sludge out of the big fryer and mixing it with some water and powder from a bag, and viola, instant gravy. Mmm mmm. Or the cole-slaw saliva combo, courtesy of some "angry" guy in the back. Or the "Excuse me, Mr. Manager guy, I just dropped this bag of raw chicken all over the floor, amongst this dirt, grease and what appears to be stagnant water. Whatever shall I do with it" / "That's alright. Just throw it in the marinader with the rest of the chicken.". Or the smell of raw sewage eminating from the sinks where the utensils and whatnot are washed. I could go on, but I won't.
I knew some guy who worked at a McDonalds and he always bragged about how he went into the freezer and rubbed hamburger patties on his penis.
I also worked at a Burger King before KFC, and I was fortunate enough to witness one of my fellow workers grab a large cup, take it to the back room, slightly urinate in it, fill it with vanilla shake, mix it with the blender and serve it to the drivethru customer who was apparently "stupid" for wanting a vanilla shake so late in the evening.