Im not sure this is my most embarassing, but its what comes to mind. I walked into math class late, because I was finishing a test. My normal seat was taken, so I sat in the back by myself. Someone said "Alana, your sitting next to Erik." I don't particularly like Erik, so I replied "Pass." Some of the class did their usual "Ooohs." I didn't realized that we switched seats, and i was a complete bitch. lol Erik forgave me at least.
My most embarassing moment was when I was the second grade and I got sick on stage during the spring concert, it was a very good thing I was in the front row!