You shouldn't cry if you can't find something.
Jerry notices he's missing his key, and he can't take his friend to the movie.
Jerry wants to express emotion over his missing key.
Jerry calmly tells his friend that he lost his keys, without crying.
Jerry cries to his friend, with tears streaming down his eyes.
Jerry is able to have a rational conversation with his friend about why the key was missing.
Jerry's friend tells Jerry he is melodramatic, and they get into a fight about it.