My parents get 2-3 calls a day from these idiots. It doesn't matter how many times you tell them to badger off they keep calling back.
I put him next to the TV when a chat show was on last time I was home. That seemed to confuse him for a minute or two, "Sir, are you talking to me?"
Think I'm going to put him on 'hold' then play a Cannibal Corpse CD at him next time.