Captain Stottlemeyer: Hydraulic fluid. Just like-
Adrian Monk: Just like the museum.
Natalie: All right. So what are we looking for?
Adrian Monk: We're looking for this.
Natalie: What is it?
Captain Stottlemeyer: [chuckles] It's the egg-eating robot from the Museum.
Natalie: He re-dressed it.
Adrian Monk: It's his alibi. Here's what happened. I mean, here's what really happened. When Keyes started playing drums a few weeks ago, he wanted the neighbors to complain. That was the key to his whole plan. Last night, the machine must have been on a timer. It kicked on at 10:30 while Keyes was across town robbing the jewelry store. Marge didn't see anybody drumming last night. What she saw was a machine.
John Keyes: Very clever, Mr. Monk. I'll take that gun, captain.
Captain Stottlemeyer: Hey, Keyes, you don't want to do this. You don't want to kill a cop.
Adrian Monk: Or a ex-cop.
Natalie: Or a ex-cop's assistant.