Ive since canceled my home phone and now only have a cell, which doesnt get telemarketers nearly as much. But what I like to do if you have time is just go along with it as long as possible most of the time you dont have to say much as they have huge scripts they have to read from. Then at the last minutes just say nevermind. Or you can do some pretty funny things with sound boards of celebrities.
Arnold-Kindergarden Cop: "Who is your daddy, and what does he do?"
But thats all of course if u get to talk to someone real.