A friend of mine once used this one after the same telemarketer called the 5t time.
F. Well, that sounds very interesting, but I never buy anything over the phone.
T. Oh? And, why is that?
F. Well, I'm Amish and my religion forbids me to use a phone.
T. But, you're using a phone right now.
F. What? OH NO! OH MY GOD! SEE WHAT YOU'VE DONE? OH MY GOD!
He didn't get anymore calls from that company.
