Mr. Monk Takes Manhattan - S3-E1
Trivia: When Monk is playing the 'find the queen' game with the crooked busker, one of the onlookers is Andy Breckman, the show's creator. He can be seen smiling in a close-up shot of him after Monk wins a second time. He has glasses, a beard and moustache, and is bald on top.
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.