Chat line number
I just received one of the strangest phone calls (and trust me there have been a LOT) from someone who said they got my number from a chat line. Considering how I've never called a chat line, and I told the person so, he went on to ask if I had given out my number on an IRC or MSN chat, both of which I never do. After a pause, he went on to ask what I do for a living!
My number is being circulated everywhere - I have heard of people giving out my number and passing it around to people in the queue at SPCA. It's probably being scrawled on walls at bus stops! :) The funniest calls are from people who call me and say they got my number but then say in a film noir-ish tone of voice that they can't say from where!