I work at a hotel, so I get to see a lot of "dinner party" bands playing. Anyway, there was this band playing a wedding last december. I know, it's an odd time to have a wedding but there you go.
Anyway, the band rolled in at 5, ready to set up in the Classics suite when the main dinner was over (they would be playing after the buffet that night). Now, I was working til late that night, so I was looking forward to watching the band. I always look forward to seeing these bands, by way of passing the time while I serve food (and young lads gotta finance his GAS somehow

).
Anyway, these guys come in at 5, and start setting up when the suite was empty. The guitarist went over and got his Soldano amp out, started setting it up, plugged his Strat in and started playing, not for any reason, because the PA board wasn't even in place, and neither were the PA speakers. The Classics suite is relatively large, so I gave them a hand pushing some of the speakers in (big 18" ones!).
As I was doing this, I could hear the bassist and the guitarist arguing. The drummer seemed to be getting mad at the bassist too, but eventually they shut and up and the bassist went back to fiddling with his Ashdown amp. Anyway, he asks their roady to bring his bass through from the hall, to which the roadie replies he hasn't got it. The roadie thought the drummer had it. The drummer said he thought the bassist had it.
So, the bassist leaves, and dashes home in his car to get his bass. A few angry words were exchanged as he left, and the guitarist and the drummer proceeded to have a pretty cool jam.
Anyway, nearly an hour and a half later, nearing 7PM, the bassist comes into the suite, sweating like a pig, shouts and insult at his less than impressed guitarist and proceeds to take a Cort out of his hard case. The guests are arriving in the suite, I'm darting about with canapes and my brother is serving champagne to the guests. The bassist plugs in, seemingly forgetting to tune his bass, makes a quick approximation of his EQ when crouching by his amp, then shouts over to the guys at the desk "just slip 'us in there at the bottom end lads".
Anway, the band look less than impressed at him, the singer and the guitarist talk quietly to themseves, before leaving with the drummer to the back rooms where the bands wait for their cue. The bassist ended up in the hotels public bar, called Chats (I saw him knocking back shots of gin, who on eart drinks Gin by the shot?).
Anyway, I got on with my night, and everything was fine until the band turned up. As soon as they staretd playing, I could hear the bassist was fiercely out of tune, every note was far flat of what it should have been. His tone was also awful, his strings sounded relativley new, with enough zing to cut through. His loud, annoying tone was getting to everyone. At some point, the drummer and the guitarist told him to sort himself out, he was quite drunk and a slanging match soon ensued on stage. He had been messing his parts up for the past 20 minutes, but when they tried to play "Want you back" by the Jackson 5, the music stopped completey. The bassist stopped play and stepped near the singers microphone and called the guitarist a "f****** W@n***". A full scale argument ensued, he left the stage angrily and took his gear, and persumably drove home drunk, endangering the lives of others (my collegues went to warn him about drink driving but it seems he had made a quick escape.).
The band apologised about him, the bride left in tears and they were all offered a sympathy pint from the bar staff after the drunked bassist ruined their set.
Stupidest thing I've ever seen on stage.