Originally Posted by Comfortably Numb
Sisters Of Mercy
Iron Maiden (but the other times I've seen them they were excellent)
Oasis (seen them be great, and utterly woeful)
Judas Priest / Megadeth. Wend back to the bar 20 minutes into Megadeth as they were shit. Half an hour into Priest we left the gig entirely.
Think that's it. And given the number of gigs I've been to, that's not bad going.
Oh, and to highlight just how bad those gigs were, I didn't walk out of either Cannibal Corpse or Dragonforce on the two occasions I went to a gig by accident.