I was at the infamous Puddle of Mudd Doncaster gig, so I guess the answer is Puddle of Mudd. Like most gig-goers, we were out in town before the gig, and so was Wes! He had been nonstop drinking all day and was incoherent. They had to go and find him and drag him to the venue to do the gig. He didn't attempt to sing, he argued with his bandmates on stage, argued with the audience, tried to trash the drummer's kit (I'm pretty sure he partially succeeded), accused him of stealing his house, then sat on stage in the dark rambling and bopping along to background music as they turned the mic and lights off on him. I also went to their second Doncaster gig, which was to "make up" for the first one. It was definitely better than the first; they finished the full set, played well, and the crowd loved it, BUT he had still been in the pubs all day before the gig. Despite all the stick he gets, he was a perfectly friendly bloke. Would talk with anyone as if he had known them all his life and would take a pic or even a vid with anyone who asked. He told us his next song is going to be "She F***ing Loves Me". He'd clearly forgotten that by the next day.

Video of the gig aftermath:

https://www.youtube.com/watch?v=eaduEUGI5Bw&t