A guy I used to work with would invite them in. They would banter back and forth until they gave up. He loved it. He said he never seen them again. LOL
My ex-FIL (RIP) went to Jesuit school, and he used to have fun with the Mormon's (I think) who came knocking on his door. He was one of those "wicked smart" guys, and family lore tells of him converting them a couple of times.