Everyone knows the dreaded Blue Screen of Death, even if they've never used a Windows computer. It's basically the universal symbol for a crashed computer. So of course, you'll want that on a belt buckle.
Too nerdy for you? There's also a Pong belt buckle from the same shop, although that's a pretty small step up the geek ladder. If you're gonna go for it, you might as well go all the way with the BSOD one.