When I have nothing better to do it's fun to see how long I can keep one of these jerks on the line.
You can hear the excitement when some creep named "Eric" in Mumbai begins to think that he has a live one on the line and that his family might actually eat today. Yes, it's cruel, but who would deny me these little pleasures.
I do the same. My greatest victory was when a telemarketer swore at me while claiming i was too dumb to see what a great deal i was missing and then he slammed the phone down.
I used the circular question ploy. After a while he must have gotten in to my games.