Not the same thing, but I was trying to send my marriage counselor an e-mail and copy my H. Started typing in MC's name, and Gmail autofilled my mother-in-law's e-mail--their first names start with the same letter, and she's often on e-mails with H, so Gmail just assumed... So almost accidentally sent my MIL an e-mail meant for our marriage counselor (at least she does know we're in counseling).