There's a guy named Tom Mabe who has a series of CD's called "Revenge on the Telemarkers." He records all his phone calls and when it's a telemarketer he gives them some absurd story until the telemarketer is either so angry or confused they hang up. Then he releases the best on CD.He had one convinced he was drunk on his car phone, another that he had to translate the whole call for his Korean wife, another that he was interested in bay windows for his automobile.
It's juvenile at times but very satisfying.