I went to see a six band metal set, featuring Destruction, Kataklysm, Graveworm and Vader as well as two other bands that I don't even know the names of.
We waited for a good three hours after doors only to find out the bus upon which Graveworm and the two other bands is broken down somewhere outta town and they won't be playing that night. Sucked for me, because I basically only came for Graveworm. Not having to sit through two other bands before the good bands was giving me some solace.
First up were Destruction, and they put on a really kick ass show. apparently, there was a guy in the audience who'd been at one of their shows in the 80s in germany. small world. the vocalist's showmanship really made me realize what a professional musical entertainer really is, and made the show a lot of fun after standing around for 3 hours in a shitty club.
Next up were Vader. Vader was an interesting set. They played pretty normally, but about three songs in, my friend and I notice that the guitarist looks kinda out of it. Staring at the ground, his guitar, sometimes keeping his eyes closed for lengthy periods of time. About this time, it appears that the guitarist just only realized that there was an audience and it was a horrible many headed beast. He stares at us in wild-eyed horror for the remainder of the song, after which the vocalist called a short recess and the entire band surround him and dragged him backstage. After a period of about 20 minutes, they come back out to finish the set, he doesn't take his eyes off his shoes.
Finally, Kataklysm played. The lead guy's stage presence paled in comparison to Destruction, and made the whole set unenjoyable. Perhaps it was the 5 hours of standing on my feet and just wanting to go home and sleep at 2am
All in all, not exactly a "ruined" set as it sits in my mind as the most memorable show I've ever been to, save for Mortiis.(lol!) But definitely the most not-according-to-plan show I've seen.