There was a doctor up North who kept confusing my gmail address for his own. I would frequently get invited to speak at medical conferences, invited to weddings, stock tips. Regular sort of thing. I made generally polite requests to keep this at bay, and for the most part it took care of it until the next time.

I did finally lay waste to the problem when he decided that the prepaid Verizon phone he set up for his mistress needed to be associated with my account.