When I was dating my future wife, she worked as a waitress. One day, I happened to go to her restaurant for lunch with my boss who is a woman and another co-worker. My gf happened to be the one serving us, but she didn't acknowledge knowing me at first since I was there was for a "business" lunch and she didn't want to interrupt it. Seeing an opportunity for humor, I slapped her butt and said, "Thanks, gorgeous!" after she took my order. My boss nearly had a seizure and was probably about to fire me until I introduced the waitress as my gf. A good laugh was had by all at that point.