In '09 when they were touring with Dethklok, Bill was having dinner at the same place I was but I didn't see him until I was walking out. I wanted to say something to him, but he was eating and was with somebody so I just let it go. If he was alone, probably would have just said something stupid and offered to buy him a beer.
Meeting your heroes can be tricky. Learned the hard way in '94 when I ran into James and Lars at a Sharks game. Lars was at least good enough to sign something for me even if he didn't seem too interested, but James just looked off in another direction.
Met Jeff from High on Fire in the crowd at Intronaut/Animals as Leaders and talked to him for a bit. Super cool dude.