The one that instantly comes to mind is the story of Wild Island...

Wild Island is a water slide park in Reno. One summer in high school, My friend convinced me to go spend a day at this place, dispite my protests. After dumping people off of rafts in the lazy river pool (this is relevant to the story as I think it was THIS that gave me bad karma) I decided to try one of the more exotic slides. In line, I was kind of staring at the hunky life guard and after my turn I went to walk past him to get in line again. I slipped oh so gracefully on the wet concrete and landed flat on my butt right as I passed. He of course checked if I was ok, and helped me up but I was sooo embarased. I hid from that slide the rest of the day.