Almost never and only when there is a strange knock late at night.
But during the day, I will make a point of having a gun when it is Jehovah's Witnesses at the door.
Maybe they will leave quicker then.
(no offense to anyone who knows a JW, but I hate it when they won't take a hint and keep me busy for an hour talkng just because I am too polite to tell them to leave me alone)