I can't find it now, but I once read a blog post from a developer of some paid product who would give a free copy to anyone who asked, as long as they used the

I can't find it now, but I once read a blog post from a developer of some paid product who would give a free copy to anyone who asked, as long as they used the word "please" somewhere in their email. It was amazing how many timewasters this simple heuristic weeded out.