The Twilight Zone, Season 3

Narrator:
We direct your attention to the man with the sleek, black briefcase. His name: Dr. Mallory Craig. Occupation: psychologist, newly employed by the Crest Ridge Sanitarium. For the last two weeks, he has been visualizing his first day, looking forward to it with eager anticipation. But there's a terror behind those cold institutional walls that nothing in his education has prepared him for.