My dumpy Jewish-looking (Half Ashkenazi) mother got us blacklisted with the Mormons many, many years ago.

They showed up and offered her a free Book of Mormon. She accepted and invited them to come back in a week to discuss her reaction to it.

In that week, she read it cover to cover and did a full analysis.

My mother was a theologian who had every academic qualification to wear the cloth in the Anglican church. Unfortunately, at that point it still required a penis.

She analyzed their holy book better than they did. In a week.

They never came back.

My father dealt with the JWs by "setting the dog on them." (The dog was completely harmless, but...)