I got a good one the other week. If you remember my saga - my computer died, I eventually got a new laptop (sales)and when I finally got connected there were all sorts of problems with it so I had to take it back. There was no other computer immediately available so I went home computerless.
NEXT MORNING I had a phone call from an Asian gentleman who assured me that he was calling from Microsoft and that I had downloaded a devastating virus onto my computer. He continued in this vein, blinding me with technology, against my feeble protests. When I eventually got a word in and told him I didn't actually have a computer at the moment, there was a short silence and 'Bye!
He'd probably have gone on to ask for a payment to download a programme to sort it out. It was nice to stymie him. :)