I once met John Tardy from Obituary and got him to sign my gig ticket, he was a pretty cool guy. Also, GWAR were sorted, they don't half put on an awesome show. Unfortunatley when they came out to the bar afterwards though they had taken their costumes off which was a bit disappointing as i'd have liked to get some photos with them like that, nice guys though.
I know what you mean Trench about not being able to approach people sometimes, I saw Poison the Well once at a tiny bar in Leeds, they're one of my favourite bands of all time and I got there early to find Jeff, the vocalist sitting at the bar and I just didn't know what to say. I really regret not approaching him but I got cold feet