Mine aren't near as bad as some these...
I once gave my boyfriend at the time a bloody nose by kneeing him in the face in bed.
Another time, one of my guy friends, and we were both really drunk...he thought he was the greatest in bed, that he could get any woman off...but when I'm drunk it's nearly impossible for me to get off, so he just kept going at it til I was finally like, "Dude, that's enough, it's not going to happen and you're going to have to accept it." Then I went to pee (you know, after having drunk that much, I had to pee really bad) but apparently he'd been banging away for so long he'd made something swell up and I couldn't pee. At all. I tried for like half an hour. I ended up going home and feeling sick for like two hours until I could finally pee.
Another time, with a British guy I was dating (who was very openly bisexual) and a friend I'll call John. The Brit and I had an open relationship, and neither of us knew that John was bi...but he propositioned us one night. We all went back to our place and were having a lot of fun...but then the Brit gets all pissed off at us because he said we were leaving him out. So John goes over to him and is trying to comfort him and bring him back to the bed, and the Brit just starts crying and yelling at us to get out of his room. Here's a bit of advice: don't ever start crying during a threesome. That was so incredibly embarrassing.