Just 5 mins. ago on the phone had this man (couldn't make out whether he was Indian, Chinese as he was shouting his pitch) telling me that my computer has been giving out "error messages" online, whatever that means, and when I said there was nothing wrong he said "Oh, so you're a technician are you?" and I said yes, which I am but not in IT - at which point he put the phone down on me.
So, if you get one of these calls - tell them that you are an IT techie.
Trouble now is that I wish I had led him on just to see where he was going with it, and how the F did he get my unlisted number?