This is exactly what happened to me yesterday.
I answered the door to a sensible looking bloke, middle aged but carrying the obligatory case that all Jehovah’s carry and the conversation went exactly like this:
JW: Good afternoon, have you ever wondered why the country is in the mess it’s in?
ME: Where are you from?
JW: I am not from any political party.
ME: Where are you from then?
JW: Kingdom Hall.
ME: Not interested mate.
JW: Yes I understand that but have you not ever wondered where we are all from?
ME: No - I already know where we are from.
JW: And where is that?
ME: Aliens put us here as an experiment.
JW: (Looking very surprised at this) What makes you so sure of that - have you ever seen and alien?
ME: No but I’ve never seen a god either (suppressing laughter so much a little bit of pee nearly came out).
JW: I will leave you in peace sir - good day.
I thoroughly enjoyed my little chat with this guy, I will have to work on it to expand it a little.