It depends on if I'm in a good or bad mood.
If I'm in a bad mood, they get called every name in the book.
If I'm in a good mood, I'll sometimes play along with whatever they are selling/pandering.
Twice I've had my wife laughing hysterically and in tears from laughter. Once with one of those 'Windows security' calls where I spoke broken english and with an accent for nearly 30 minutes with whoever was on the other end. And again with a window salesman when I was constantly telling him we didn't have any windows and I had bricked them all up.