"Nervous Man in a Four Dollar Room" is episode 39 of the American television anthology series The Twilight Zone.
According to the book The Twilight Zone: Unlocking the Door to a Television Classic by Martin Grams, Serling wrote the teleplay in response to a request from CBS to write scripts using as few actors as possible for budgetary purposes.
This is Mr. Jackie Rhoades, age thirty-four, and where some men leave a mark of their lives as a record of their fragmentary existence on Earth, this man leaves a blot, a dirty, discolored blemish to document a cheap and undistinguished sojourn amongst his betters.
A puff of smoke emerges from the other side of the mirror, and he sees reflected a different version of himself: a strong, self-assured, confident man.
Jackie and his reflection engage in a lengthy argument about how his life has turned out as a result of going along with peers and never standing up for himself.
Jackie opens the door and orders a bewildered George out, tossing the gun after him and telling him to never come back.