that's not my wife

that's not my wife

I've seen a couple movies and tv shows (can't remember any of them specifically) the way i remember it is somebody walks into a room and someone else is finishing a joke that ends "that's not my wife that's a ect...". I've personally never heard a joke that goes like that so im wondering if any of yall have or it's a movie thing.

Also don't know if this is the correct subreddit this is my first post