In some cultures, people believe that some of the moon's dark spots and craters create a pattern that resembles a human face when the moon is full, which they call The Man in the Moon. In literature and art he is more frequently depicted as a real face on drawn onto the moon, or even as a person who lives in the moon.
Grover also encountered the Man in the Moon in Astro-Grover, a 1987 computer game. In the game, players help Grover to count Zips from the planet Zap. If the count is incorrect, the Man in the Moon shakes his head and encourages the player to try again.