OMG, that's when *I* saw Slayer!! Clash of the Titans, 1990, here in Houston. I won tickets to that show on a local radio station, so that was cool...and then when we got there and found our seats, some kids behind us called out to a couple of other kids that were walking by, talked for a couple of minutes, and then one of them said to me "excuse me. Are you two just here together, or are there more people coming?" I said it was just me and my friend. He said "do you want to trade tickets? We want to be with our friends."
Our box seats weren't bad, but their friends' tickets? 10th row, floor

Pretty excellent deal for free

All bands killed too.
Saw Ozzy with Anthrax back in '89 or so, but never been to an Ozzfest. Oh well.