Blackmailing David Leterman.

http://www.huffingtonpost.com/2009/10/01/david-letterman-extortion_n_307221.html

Remember kids, moral reputations are not very important to comedians, certainly not worth two million dollars. If you're thinking about blackmailing a comedian, writer, or musician, you'd be better off just robbing a bank.

And I shouldn't have to tell you that if you're doing any sort of illegal business by check you might as well just lock yourself up now.