What do you say to missionaries and JW when they knock on your door?

Today some JW ladies came by. They didn't start with a religious pitch but began by asking if I was concerned with the state of the world. I thought they meant politics and took the bait, chatting with them about my concerns. Then they started mentioning end times...

I patiently explained my beliefs and countered their points, in the most respectful way I could. I could tell they left a little unsettled. I guess I technically came out of the broom closet because I was honest, and they will probably gossip all over town.

Anyway, I would love to hear your experiences with missionaries and what you usually say to them?