A buddy of mine was teaching me to play years ago, but I never had to time to practice. His tip to me was always keep a pick in your wallet, just in case you ever need it. So, I do. Gotta be prepared for everything.

Really though, you never know when you might need a little piece of plastic like that. Its come in handy a few times as a little wedge or bookmark. I've even heard of people sticking them in the side of closed door frames, that way they can tell if someone has entered the doorway while they were away.