Tony Hawk's Pro Skater 3 is one of my favorite games, and somehow I always end up finding a cheap copy of it somewhere. I think I own it on every console I can own it for, primarily out of luck. It's a good game.
When I was in high school, I kept buying up new copies of NCAA Football 06 because my XBOX either scratched them to death or that game just had a problem with temperamental discs on the XBOX. I don't know if anyone else has had this problem, but I probably have purchased five copies of NCAA Football 06 for the XBOX in my lifetime. They're never more than like four dollars anymore, so it isn't a huge problem, but I can't understand why these discs degrade or stop working so quickly.