First concert was AC/DC on the Ballbreaker tour. My old man took me and my brother. It was pretty cool, I was about 11 or 12. First concert without Pops was 1998 I saw Slayer with System of a Down and Clutch opening. It was fuckin sick. It was the first time I had ever heard of System, when their singer first came on the stage and was messing around with the microphone I thought he was a roadie. Then he just started screaming a bunch of weird stuff, and a few minutes later the band started playing. They were pretty good, and would go on to become a huge band. Clutch was badass and I actually just saw them opening for Lamb of God a couple months ago. But Slayer blew both bands away obviously. I've seen Slayer a bunch of times since but that was the smallest venue I've seen them at and it was intense/