I once had a irate business owner call me after I placed an order, demanding to know why their business name was in my e-mail address. After I explained it: "That's pretty clever."
I tried to order a textbook online and my transaction got flagged as suspicious, so I had to call a support person, and he wasn't having it. - foreign credit card - address marked as non-residential area - sketchy email-address using their company name
Had to take the bus to a bookstore.