Cold caller: Hi. Would you like to save money on your long distance bills?
Me: No.
Cold caller: Ummmmm. Ohhh Kay...
Me: Bye
Took them out of their opening book in one move.
Check and mate.
I just tell them "We're a Linux household, no interest in windows" and slam the door. I think the look of bewilderment is worth it.
Cold caller: Hi. Would you like to save money on your long distance bills?
Me: No.
Cold caller: Ummmmm. Ohhh Kay...
Me: Bye
Took them out of their opening book in one move.
Check and mate.