Logical Assault

A co-worker and I were walking down the street when we were confronted by a guy with a clipboard. He was earnestly collecting signatures for something or other having to do with stopping climate change.

(spiel ends with request to sign his clipboard)

Me: Earth's climate is always changing.

Him: Dude, if we don't stop it, the whole ecosystem could collapse!

Me: So you want to alter the natural process to save the ecosystem.

Him: There's nothing natural about it. There's too many people. Changing the climate.

Me: If you really cared about the planet, you'd step off this curb right in front of a bus.

Coworker: That would really screw up traffic.

Me: -you'd walk a few blocks and jump off the bridge. You know, to save the planet.

Him: Dude, you're crazy!

Me: What a coincidence.