This morning I got two of those calls we all just love to get: those people who call you up and either ask you for money or are from a company you are affiliated with in some way and are trying to sell you something. I call them "pest calls", and they really irk me, especially when they call you at busy times, and especially at dinner time. I have caller ID, and the ones that come up as "UNAVAILABLE", I always ignore. (Besides they NEVER leaving answering machine messages so the call can't be important anyway.) There are also those times when I tell them to call back in a month or so, and yet they will call again the next day.
I figured out a while ago that these calls are placed by a computer, and there is a one-to-two second gap before the person gets on to give you their story. When I hear that gap, I immediately hang up the phone. They never call back, at least on that day. I got an email a while back that the way to get back at these people is to tell them to hang on, and leave them on the line for 15 minutes or more. Not a bad idea, but I don't want to tie up my phone that long.
I thought a lot of these calls would cease when I went on the National No Call List. Silly me. I'm sure some of these people found a loophole around it.