Young man gets hired as a secret agent... He's told to deliver a top secret package to a guy named Goldberg, and given his address. He's told to use the passphrase ""The night-bird sleeps at dawn"" to identify himself. So, he takes a plane, to a train, and then a cab, and finally arrives at the guy's apartment building. He goes up one flight and knocks on the door. Guy answers. ""Are you Mr. Goldberg?"" ""Yeah"". ""The night-bird sleeps at dawn."" ""Ohhhhh you want the other Goldberg. He lives upstairs in 3B"".