My first time playing in public (on stage) was opening up for a local joke band, Brick Stonewall and the United States of Awesome. Brick is a hillbilly, right wing, redneck, republican, rock band in which all of the members dress up as characters and perform as a show beyond the music. I was hosting this show, and as part of their act, when I introduced them, I played Soundgarden's "Blow Up the Outside World" on my ukulele. I bombed. I was really nervous. There were all these people expecting to see a rock band play, instead got me playing a ukulele really poorly. Then, as part of the act, Brick (the lead singer) came out from the back, grabbed a mic., told me that I sucked, and smashed a beer bottle over my head.
The beer bottle was fake, BTW. It was made out of sugar and whatnot and just shattered instantly. I collapsed and laid on the stage motionless while Brick called the rest of the band up to begin their set. The guitar player (who I also am in a band with, Brick being his side project) played the first song with his foot on me, and kicked me around a few times before I grabbed the edge of the stage and pulled myself off. I stumbled through the crowd grabbing my head milking what just happened.
It was all part of the show. My complete and utter failure on the ukulele translated to a better performance for the band, so it kinda worked out well that I bombed. It was weird though. I had practiced the song a lot. I had it down, and I have played hundreds of shows in front of thousands of people. Yet, when I got up to perform and sing by myself, I was crippled by fear. I guess it's a whole lot different when you're playing with a band, than when you are going solo.