Wow lot of talk about the mug. A few words from experience. A man only needs one mug, Drink, dump rinse fill repeat. Also as the father of a toddler he will always have a mug of coffee with him. The only thing that sleep depraved nights will alleviate. Also by the looks of the mug it was a gift from the woman so he is obligated to use it everyday.
I’ve never seen one of my counter cleaners even try to look guilty. It’s always a, “What are you going to do about it!” look.