It is unlawful to lend your vacuum cleaner to your next-door neighbor.

A door on a car may not be left open longer than is necessary.

No one may allow their cellar door to remain open.

You must never leave your car keys in the door of an unattended vehicle.

If a Leprechaun calls at your door you must, by law, give him a share of your dinner.

While riding in an elevator, one must talk to no one, and fold his hands while looking toward the door.