Hahahaha, oh man, I've got stories of friends of mine who used to mess with peoples food back in high school. It'll turn your stomach. A couple friends of mine worked together at Pizza Hut once, and they'd have a big pot of the pizza sauce all mixed up. One of them would go "Hey <other friend's name> look", and then hack up some lung butter, spit it in the sauce and stir it all in, so everybody who ordered something with sauce got a little. Friggin' uncool. I think people who do sht like that need to be locked up for life.

The same guy used to mess with his co-workers (more friends of mine) and for example, would see that one of them was busy, but eating a slice of pizza, taking bites every now and then, and setting it down while busy ... so when he wasn't lookin, would take that super hot jar of shakable red pepper, and lift the cheese up off the slice of pizza, douce it in those peppers, like a thick layer of it, then put the cheese back on so you couldn't see the difference. Along would come <other friend's name> and take a bite, and .. you can imagine what happened.

I ran with some insane friends.