Quote from Adrian Monk in Mr. Monk and the Naked Man
Adrian Monk: Well, he got out. Somehow, he got out. Captain Stottlemeyer: And back in again. Without the guards noticing. Adrian Monk: [to inmate] Excuse me. Where did you get that? Man: From the guard. Adrian Monk: How about this? The guard gives Singer an apple. Singer chews the apple core into the shape of a key. He fashions a rudimentary kiln using that light bulb and a sardine can. He hardens the apple core in his kiln, and uses it to pick the lock. Thank you. Natalie: An apple core key. Adrian Monk: No?