The Reluctant Astronaut

Roy (Don Knotts), a perpetually terrified 35-year-old man-child, still lives with his parents. He plays an astronaut at a local fairground, but his father (Arthur O'Connell) wants him to be a real astronaut and lands him a place at NASA. On arrival, Roy discovers he's just a janitor, but he keeps up the charade, which eventually gets him fired. When NASA wants to send someone unqualified into orbit to one-up the Russians, however, they send Roy into space, where things invariably go wrong.