Hadn't found any funny jokes here yet. Here's my candidate.
There was a knock on the door this past Saturday morning.I opened it to find a well-dressed young man standing there who said:"Hello, sir, I'm a Jehovah's Witness." So I said, "Come on in and sit down."
I offered him a fresh cup of coffee and asked, "What do you want to talk about?" He replied, "Beats me – nobody’s ever let me in before!"