Best one I had was one cheeky get ringing me up to advise me that my artwork was ready. When I told him yea and verily to sally forth and multiply he tried to guilt me into advertising in a safety booklet which would "STOP CHILDREN GETTING HURT." There was also the one calling on behalf of "The local ambulance and police" with pretty much the same thing.
I have noticed that within around 10 minutes of getting your free advert on Yell.com you get every spotty telemarketing numpty for a zillion mile radius blocking your phone and being a "cul de cochon" about going away again.