Mr. Monk and the Three Julies - S6-E13
Dr. Kroger: So, uh, a glass eyeball, huh?
Monk: The mother died three months ago. The son never reported it.
Dr. Kroger: Wait, did the son kill the mother?
Monk: The doctors say no. It was a heart aneurysm. Her son, Matthew, is an amateur taxidermist. He stuffed her body. He carried her from room to room like nothing happened.
Dr. Kroger: Yeah, I've heard of cases like that. See, he couldn't function without her. They call it "radical cognitive bonding."
Monk: At least I never dug Trudy up and had her stuffed and mounted, right?
Dr. Kroger. Yes. And I've always been very proud of you for that.
Answer: Notice also that in the opening credits scene when he is touching parking meters her also wipes his hand on his clothes each time he does it.