This story occurred when I was 18 and a pushover. The Special Snowflake in the story, however, remains one of the worst I have encountered.
I was in a drum corps, which is like a marching band with only brass instruments and drums. One day after a performance, we were going to have a group picture taken with everybody in uniform. Special Snowflake, who was one of the most talented musicians in the group, is one of the worst people I have ever met. Before the picture, she happened to have misplaced her hat which was part of the uniform. SS goes up to other people demanding their hats (not even asking, but telling people to give her the hat), because of course she is more important than they are and she doesn't deserve to go hatless in the photo (despite the fact she is the one who missplaced it). She demanded my hat and I was almost dumb and intimidated enough to give it over (SS was kinda scary and I am non-confrontational by nature). Thanks to a friend, I was talked out of giving my hat to her (and looking like the goof who forgot her hat in the picture). I think somebody found SS an additional hat the last minute.
Another story about this SS. One of the rules for drum corps practice was that we had to wear white shirts. I kept a spare in my backpack just in case. One day Snowflake doesn't have a white shirt and goes around asking people for one to borrow. I took pity on her (punishment for no white shirt was running laps) and offered her the one in my backpack. SS was not in the best of shape, and it was a hot day so running laps would have not been ideal for her. I told her it had been rolled up in a ball in my backpack for quite a while and probably wasn't in the best condition. SS said she was just happy for the white shirt. Later that day, I overhear Special Snowflake telling whoever would listen how gross and stinky my shirt was (I hadn't worn it, but it was in my backpack for months). I can't believe I just helped her out and this is how I am repaid. I still wish I could go back in time, keep my 'gross, stinky' shirt in my backpack, and watch SS run laps.