...when you go into the gym locker room and can't remember which locker is yours because all the locks happen to be the same color, and you end up having to try to unlock 6 before you find yours, which just happens to (naturally) be the last one you check. Mind you, I actually started panicking and thinking that maybe I'd forgotten to put the lock on the locker and someone made off with my purse. I must have looked like a crazy woman going through all the locks.
I really should get one of these:
I doubt there's one like it at the gym.