Why?
As a way of saying fuck you and your mind-controlling cult that broke up my family.
Make a sandwich board (freestanding type) with It's a cult! and www.jwfacts.com on it in big letters and stand it right next to the JW.org cart. Stand within rescuing distance of it as the JWs will try and remove it within 30 seconds....
I really like that idea. I think I know where I can get a pavement sign.