I saw Ozfest in like 2003. (Don't remember the exact year). Rob Zombie and System Of A Down were on the bill. I'll never forget Zombie kicking a guy sitting in the front row, who was actually sitting during Zombie's set, kicking the guy out of his seat and giving the seat to a kid at the very top of the lawn seats. Got in the crowd and everything.
What I remember about Ozzy's set is that he had a water fetish. The vocals sounded spot on though.