I just found a tape of my first band, aged 15, playing "VIKING ROCK" (the biggest musical export of Norway is blackmetal - we figured we'd try to make some money) that features my mate Martin jumping around a drum and beating it vigorously whilst I play the shittest guitar riff ever and shout things like "PILLLAAAAAAAGE LINDISFAAAARNE!!!!!"
I pray to all that is sacred that no one ever hears this.

What's your most embarrassing musical moment?