The best way to thwart a JW is to tell them you were brought up as one but got thrown out (disfellowshipped) for sex/drugs/rock and/or roll - any combination of the three and with details as gruesome and degenerate as possible (to welcome them into the 21st century properly). They all carry little cards around with them to identify those who are not worthy...you may get the odd visit from enthusiatic ones who are trying to save you, but they soon get bored. Alternatively, you could try my dad's method of swearing at them for ruining his sunday and chase them down the drive with the nearest implement to hand (for fun, of course!). This will also go down on that little card as well. Mr was brought up a JW and used to enjoy 'vigorous' discussions with them which were hilarious - and I am a (very) lapsed Catholic. Dear God - perhaps we should never answer the door again...