I remember reading about replying to all offers that have business reply mail, and putting heavy things (like strips of lead) in the envelope so they would have

I remember reading about replying to all offers that have business reply mail, and putting heavy things (like strips of lead) in the envelope so they would have to pay the postage charge - but still wouldn't get your information. I love the idea, but am not willing to take the time. If there were some (legal) way to guarantee this would happen on a massive scale I'd be game.