So, you want a multi-tool so you're never without important things such as screwdrivers and bottle openers. You also want to show off some geek/gamer cred. This should fit the bill nicely.
This Space Invaders multi-tool features both a flat head and philips head screwdriver and a bottleopener, all while maintaining the iconic shape of the Space Invaders alien. Sure, at $24 it's pretty pricey for a keychain with a couple of tools on it, but if you're a big Space Invaders fan it might just be worth it to you.