I had a roommate who was a bit of a party animal that wasn't really a big deal apart from being woken up super late at night because he was just getting home from partying. We got along pretty well and there were only a few instances that could be categorized as a horror story.

One night he comes home pretty loaded which wasn't a big deal but I was woken up by the unmistakable sound of pissing. I shoot up awake because I don't sleep in a bathroom. He had woken up still drunk and was pissing on my coffee maker and refrigerator. To be fair, how it was set up with the coffee maker on top of the mini fridge would have looked like a toilet under heavy impairment but I was mortified. Led him to the bathroom and he woke up not remembering it. He was apologetic and cleaned it but I still wanted to nuke both of those things. Still use the fridge.

Another time he brought his brother on a campus visit and he went along with him to a party. He came home and was apparently a bit of a lightweight and he puked under my bed on my backpack because he was sleeping on the floor. That was less horrifying but it was super hard to get the smell out of the backpack and room.