From Overheard In New York:
Guy: I don't need a bag, thanks.
Store lady: You're going to carry that in your hand?
Store lady: That's fine with me. I love customers who don't want bags.
Guy: Why waste them, right?
Store lady: Yeah. People need to recycle. They keep cutting down more and more trees for these bags.
Store lady: Plastic bags are made out of trees, right?
Guy: ...Well, no...
Store lady: Oh, I think it's paper bags that are made out of trees.
--Duane Reade, 22nd & Park