2 incidents spring to mind. Both from high school and both involving bodily fluids as it were.
Note before we continue, you might have gathered I did not have the happiest high school times and whilst I was not constantly bullied, my life was not exactly a happy one with certain entitled ass wipes who seemed to think the world owed them a living. And we're back in.
So Matric dance after party 1998. I woke up morning after hangover deluxe. Went to the bathroom and one of the above entitled shits had passed out whilst throwing up in the toilet the night before. There he was head hanging in the porcelain. I must say it were anyone else, I would have moved or rolled them next to the toilet and gone for a pee. However, because it was a him, I unzipped, and unspooled and pissed all over his head. He briefly came around and moaned something about it being warm.
He promptly began snoring again, so I washed my face and brushed my teeth and as I was leaving flushed the toilet. Briefly heard him moaning about it now being cold. Sweet revenge no. 1.
Then about years later, I bumped into another ring leader. 2 years had done little to change that Italians outlook on life. He was still an asshole. Anyway, he had had a drink in him at a mutual pals party and was on his way home. I had just happened to have finished my training with a security baton and had it in my car. This guy was blind drunk. So I waited for him to stumble past me in the parking lot and I snuck up behind him and tapped him on the back of the head. Knocked out. Not quite cold, but he hit that pavement like a sack of potatoes.
Anyway, I dragged him to his car and zip tied his wrists to the mag wheel of his car. I then flung his phone, wallet and car keys in different directions. I was going to leave him, but I remembered all the times he had pissed me off. So I again unzipped and peed all over his back and neck. He was remember zip tied to his front wheel by both wrists and only partially conscious. I then kicked him in his kidneys twice for good measure and got a painfully groan out of him. Well satisfied, I went back to the party.
When I left an hour later, no one had reported finding him yet! I found out later he had lain there for 3 plus hours until someone had found him! To this day, he still thinks it was a mugging!
Revenge was sweet.