This video purports to list “11 signs your cat is happy.” Look for the items in hard-to-read lettering in the lower left-hand corner (took me a while to find them). This is a very polite little cat with nice manners.
To the 11 signs of a happy cat, given here, I would add one more.
You know your cat is happy when he pulls your jacket off the back of the chair and makes a nest of it on the floor.
You know your wife is unhappy if she does that.