It has been reported here before. Went out for Christmas lunch a couple of years ago: me, Pinky, happy couple to be and bride's parents.
About halfway through bride's mother suddenly said, "Who are you?". We had been introduced
I explained I was Piink Sis's brother.
She said: "you can't be as you talk very posh and she sounds dead common."
I thought there was going to be a cat fight