Mr. Monk Goes to the Office - S4-E4
Natalie: I use to work at a place like this. I lasted about two weeks. You do the same thing everyday.
Monk: The same thing.
Natalie: After a while, you get to feel like a number.
Monk: A number.
Natalie: You're just like everybody else.
Monk: Everybody else.
Natalie: You're basically a drone.
Monk: A drone.
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.