This was around a while back but if you haven't heard it it is pretty good.

Thought you'd get a kick out of this. Turn up your speakers, and the next time a telemarketer calls to bug you, try this little script on him. He’ll never call you again, but more than that he's guaranteed to quit his job the minute he hangs up the phone as well.

http://www.howtoprankatelemarketer.ytmnd.com/