The highlight (lowlight?) was a show we played with Band X, our friends. We were all sitting around just before X went on, gettin' our guitars & stuff ready, when the lead guitar player for Band X opened his case to find all of the strings of his guitar broken, and blood splattered across the pickguard.
We all did the math, and realized exactly who did the damage... that was when we all stopped leaving our instruments in the practice room. Then there was the time that the guitar player from Band Y broke down the door to the practice room because he wanted to practice, but was too drunk to call anyone and had forgotten his key.We tried to get the college to intervene, but they had no-place else to put us, and we weren't willing to cave to a bunch of asswipes (in hindsight, a total mistake given the amount of stress it all caused). By the end, Band X had all graduated, so it was just Band Y and us. On the last day that we were in the space, as we were moving our stuff out, we hid the stacks of Penthouse mags that Band Y had taken to leaving around the space, and our guitar player (normally a very quiet & pleasant fellow) broke a bunch of their empty beer bottles around their drumkit. Not satisfied with that, he asked the rest of us to turn around while he peed inside Band Ys bass drum.
Not at all the most mature approach, I admit, but hey... three years of frustration will make people do funny things.
Anyone else got one to share?
Usually I would do such things, but during high school we were super pressed for time and only had maybe 1 or 2 practices for each show. 
