The most embarrassing thing I ever did was just yesterday at my dads 41st birthday party, my uncle Dink had his Karaoke machine and a lot of people were getting into it, and I decided "oh what the hell" so I gave it a go, the song selection was mostly country and I wanted to do something rock, I settled for The Beatles
Sgt. Peppers Lonely Hearts Club Band, because I figured "hey, I can do this one" but I dunno, for some damn reason that is even a mystery to myself I started singing in a ridiculously high falseto (not my normal tone of voice) and a barely audible one at that, I sounded like an incredibly drunk, off-key Jon Anderson, and I kept screwing up horribly on the verses, even though I knew the damn song by heart, typical stage fright.
And worst of all, IT WAS VIDEOTAPED, AHHHHHH!!!
Of course I doubt anyone can top that, but I'd like to hear some of your embarrassing stories so maybe I wont feel as bad.