best show i ever saw = metallica on the sanitarium tour in 2000 at kentucky motor speedway. i sat through a bunch of garbage all day (korn, kid rock, system of a down) to see them and they didn't disappoint
worst = when i was stationed at ft bragg, a friend of mine talked me into joining him on driving up to see sevendust at some shitty club/bar in raleigh one random night back in spring '06, probably had a few hundred folks in there. the sound was absolutely awful, it was like they were geared up for a big stadium, but they're playing in a small, enclosed space. worst part was that it was a random weeknight, and i was leading PT the next morning. I think i got 2, maybe 2 1/2 hours of sleep that night.