I had never heard of this movie until I ran across it at youtube. I find more fun movies that way! Visit to a Small Planet is a 1960 Academy Award nominated Jerry Lewis comedy. It is based on a play with the same name by Gore Vidal.
Youtube has it in 10 sections. Part 1:
part 2, part 3, part 4, part 5, part 6, part 7, part 8, part 9, part 10
The New York Times review calls it "about as subtle as a meat cleaver", but then did you want subtlety here? Moria says it's the "first occasion upon which the theme of the alien visitor was played for comedy on film" and says it's "a likeable piece of slapstick foolery". Sometimes I feel lucky to get enjoyable slapstick foolery.