My blonde wife and I got into an argument because I accused her of being stupid. Eventually she jumped up out of her seat and yelled, "Give me one good reason why I shouldn't walk out of that door!" I replied, "The plane hasn't landed yet."
I love my job as an anaesthetist. Just as my patient is about to go under, I love to call them by the wrong name and tell them not to worry your vasectomy will be over shortly!