The Light Stuff: Space Humor-From Sputnik to Shuttle by Bob Ward (1982). Introduction by Walter Cronkite. Out of print.
Bad Astronomy: Misconceptions and Misuses Revealed, from Astrology to the Moon Landing 'Hoax'" by Dr. Phil Plait aka 'The Bad Astronomer'. Written in a humorous style. Click here to read what the author says about his book.
The Light-Hearted Astronomer by Ken Fulton (1985)
A backyard astronomer guide laced with humor. It is out of print.