Paper clips as ornament hooks
Christmas decorating in true hacker fashion. From Duane:
Inevitably each year you're left with ornaments that have no hook to hang it on. Sure you can buy those packages of hooks, but you end up with 500 when you really need 5, and next year you can never find them. Know what works? Paper clip. You're far more likely to have some of them lying around, and they're just about as cheap. Bend it, hang it, done.