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
They know better than to knock on my door after they ignored the notice literally telling them to go away, saying 'that doesn't apply to us' and got chased down the street by an angry screaming nutter (me).