The one time my friend Mary contacted her ex-husband after he divorced her was when she learned that he had served his mother dinner on paper plates. She called him up and said, "You go out right now and you buy a set of plates and a set of silverware. You are never allowed to serve your mother on paper plates. Ever."
I have to admire strongly held opinions, even when I don't share them. She still gets indignant about the plates some 15 or 20 years later.