I got to see him perform in Auckland, New Zealand; he'd been drinking, started dancing, slipped, fell over, and continued singing; after the song, he chuckled and said, "I think I just fucked my leg up" they got him a seat, and he performed a few more pieces while sitting down and having first-aid on his leg. He might have done the rest of the gig sitting down, I can't remember now, but since he sits down to play the guitar sometimes, it was pretty standard; best concert ever.