I was at the house of a friend when her husband came in from work said 'Hi' and went upstairs. One of our friends was present and got very uptight because they didn't 'greet each other'. She and her husband were always very demonstrative in public. We found out later that she was having an affair!
A friend who's a caterer was at a smart country residence and she and two of her waiting staff were sitting around the kitchen table discussing the finer details of a forthcoming event with the lady of the house who was very demanding and rather po-faced. There was the sound of a door slamming and a plummy voice yelled out