Man, do I have a story about that.
Alright, so I was on a college visit for a scholarship test, and I was pretty sure I was not going to end up going to this college, so I slept with a girl there that normally I would not have slept with, due to her being a little strange. Of course, I ended up going there anyway. And so did she. And it turned out, she lived in my dorm (but, thankfully, the other side and several floors away, so she didn't discover this for some time). She then went about convincing the people I knew, including my roommate, that she was dating me. It got really weird.