This morning Kel and I somehow got on the topic of zippers.

Kel: Well you know how you're always supposed to lock your zipper down, right?
Me: (pause) Huh?
Kel: You know, put your zipper down so that it locks.
Me: I have no idea what you're talking about.
Kel: Well this friend of mine kept having her pants zipper come undone, and it turned out her zipper was always facing up, so it was unlocked.
Me: I had no idea a zipper couldn't face down. I thought it just...automatically did.

As soon as we were done I went to find a pair of pants and tried pulling the zipper apart while it was flipped up.

Did anyone else know about this?