Business Reply Mail (Score 1)

Two points: First, it's highly likely that BRM mailers reject anything over a letter-sized and letter-weight item under their indicia, so mailing bricks, roadkill, et.al. back to them no longer works. Second, I only do this to credit-card sharks (since I really don't want to cost legitimate charities, etc. extra money) but there's a terrific little nastygram at

• http://daveramsey.com/fpu/creditreb.pdf

which I print out and send back in the envelope. It starts out

Dear Credit Shark: CONGRATULATIONS! Your credit company has been chosen, out of all those in your area, to receive our special "Send us junk mail and get it back at your expense" deal.

and goes on from there. It doesn't have anyone's name on it, so they can't exact any sort of corporate vengeance, and it DOES cost them money to receive it.