I had Jehovah's Witnesses round this morning (not a very common occurrence round here).

Them: "Do you ever think about the future?"

Me: "I'm a climate scientist, I think it about the future all the time.."

@Ruth_Mottram In a former neighborhood, Scientologists often would come up to me on the street and ask if I'd like to take a personality test. I replied, "no thanks, I already have one."
@AskPippa @Ruth_Mottram This is in fact similar to one visit by the JWs years ago where they ringed the buzzer and when I answered I told them "No, thank you, we already have religion here." though we are all atheistic unbelievers at home.