That's priceless! I also liked this post someone wrote on another forum:
My favorite story comes from a former student whose favorite response to telephone solicitors was to say, "please continue talking, I've almost finished masturbating". At that point, he would begin moaning, groaning, grunting, and sighing convincingly. Occasionally, he might say, "I won't be able to write anything down because my other hand is too slippery to hold a pen." No solicitor ever stayed on the line after that final statement and few lasted beyond his first moans. Best of all, he never had repeat calls from the same telemarketers.