Worst (though possibly best, depending on your viewpoint...) moment on stage was drawing a complete blank after the song intro. Just had no idea what I was supposed to play or what key we were in or anything at all... This was back in college and the whole band were being assessed on this piece, so I completely blagged it, and somehow got a reasonable mark!
Going to see the singer for the first time in 13 years this weekend. Wondering now if she ever noticed...