Lovefilm/Amazon
Back in the day, we used to get DVDs on rental, which were sent out by Lovefilm. LoveFilm ended up being owned by Amazon.
One day my wife placed an Amazon order and entered her Mother-in-Law's address, as it was a gift for my parents.
Somehow that address got matched with her LoveFilm account, and from that day, we stopped receiving LoveFilm disks, and my parents started receiving unsolicited DVDs.
Neither of us realised what had happened and both parties went through several rounds with Amazon of "where's my DVD" vs. "Stop sending my DVDs" until several months later when we were talking about it and the penny dropped.
Biting the hand that feeds IT
