Just for future reference... whenever I open the trunk, I always leave my keys in the keyhole so I can't lock the keys in the trunk (which is what I did once...lucky the rest of the doors weren't locked yet!).
Just a note - I don't have a problem with my keys scractching the paint when I leave them in the keyhole since I never slam the drunk (nor doors, nor hood) closed like most people do. For those who do, they're usually jiggling up there so you can hear them clink - pull them out before you slam the trunk or else it'll start scratching the paint up!
