mine: i am a big guy and in sophomore year in lunch i sat down and the chair broke haha. i didn't really break it but the screws were coming out. probably the worst moment of my life lol
i got too many to choose from. but one time, the guy i like was helping me set up a keyboard, and he asked me to grab a stand to support it. instead, i came back with a music stand to hold sheet music, and he was like, "oh, is that your stand." i have so many dumb moments :S
I was at a Baseball game, and got up to go to the bathroom. Without realizing it, I accidently went into the Women's room, and didn't realize it 'til as I was coming out, I saw a woman coming in the other end. (Fortunately, she didn't see me.)