Not a wrong number, but an obscene phone call to my mom- my dad was a long distance truck driver. If the phone rang in the middle of the night, it meant he'd been in a wreck. Mom would get up, throw up, and then answer the phone. Every time.
Mid 70's-phone rings at 3 AM. Mom rolls out of bed, throws up, and answers the phone only to be on the receiving end of an obscene phone call. When mom got a chance to get a word in, she laid into him for at least 5 minutes about how he scared her thinking her husband was hurt, and made her throw up, and woke up her child (me, who was a teenager and had never heard my mom use that language).
She hung up on him by slamming down the phone. It rang again, mom grabbed it, and it was the caller from before, apologizing to her for scaring her.