Rules for Fools XIV
Rule No. 17: If you get on an elevator that is going up and you are, in fact, wanting to go down, you must either first go up before you can go down -- or get off the elevator and wait for another.

Corollary to Rule No. 17: They'll make more.

Rule No. 18: When you ask people also getting on the elevator to hit your floor button for you ("Three, please."), chances are good that they'll hit their floor button first even if yours comes sooner.

Corollary to Rule No. 18: You do the same, so what's your gripe?