Depends on what you call a scam. I got a lady friend to call a particularly loud and bombastic work colleague, profess undying love for him and threaten to arrive on his doorstep. She claimed to have met him on a business trip to London.
He was visibly shaken. (and quite a lot quieter for the rest of the week).
To this day he still does not know that he was set up. (And of course, my friend never turned up to embarrass him).