Try to reason with Jehovah's Witnesses. Score 1 point for each time they try to prove something by saying "but it says so in the Bible". Score 5 points if they agree that something in their manual isn't as accurate as it should be. Score 10 points if they want to leave plus get a bonus 5 points for getting a free Watchtower. I got 26 points once.

I live in a flat now, with an entryphone, so I never get them anymore. I did used to enjoy arguing with them, but if I am in that mood nowadays, I can simply come on here and say something that I know will get Breadmaster going :).

I wonder that the JWs haven't yet thought of email spam as a method of disseminating the good news.

They don't try very hard around here - a couple came to my door, quite elderly and passed over 2 free Watchtowers without saying much more than hello. The lady asked me if I thought Jesus was born on Xmas Day, so I just said "I dunno" and shut the door.

I have learned from experience that a little politeness goes a long way: for example:

Double-glazing salesperson: "I just want to ask you - if you could have any room in your house double-glazed for free, which would it be?
Self: "None of them, but thanks for calling." [Click]

Financial services salesperson: "Do you have a couple of minutes to take part in a customer survey?
Self: "No, but thanks for calling." [Click]

Door to door religious salesperson: "Can I interest you in the word of the Lord?
Self: "No, but thanks for stopping by." [Click]

I find that the little gesture of politeness catches them momentarily off their guard and enables you to put the phone down or close the door with a clear conscience and without leaving an opportunity for comeback.