I've seen Jahova's Witnesses go door to door, and also Mormons. Yesterday I got a visit from some Baptist people trying to sell their church to us. I explained that their god is an evil maniacal psychopath, and Satan seems like the good guy in the story, since their god wanted us to be ignorant of all knowledge, while Satan wanted us to have knowledge. Kinda like Christians vs Atheists today. Ignorance vs insight.
Anyway, I was wondering what responses any of you have had to preaching loonies at your door or on the street (I've had that experience, as well... but back then I was a much more polite guy).