I am reminded of a story that the actress Eileen Atkins told once on Parkinson.
She went shopping at Harrods, as one does and just as she was approaching the door, three men up on the scaffold gave her an enormous wolf whistle, together with some rather salty remarks. She was horrified and embarrassed and resolved to get her own back. So, later that morning, as she left the store, she shouted up to the men some very choice comments regarding the smallness of their reproductive organs and what they could do with them, and then stalked off down the road.
She had forgotten, of course, that Harrods is renown for having many entrances and the one by which she left, was not the one by which she had entered.
Easy mistake to make !