On July 20, 1969, Apollo 11 astronauts Neil Armstrong and Buzz Aldrin climbed down from the Eagle lunar module (leaving behind poor Michael Collins) to put the first footprints on the moon. That's the story, at least. A vocal minority believes that the moon landing was all an elaborate hoax filmed on a sound stage in Hollywood.
Among their evidence is the fact that photographs and video footage don't show any stars in the sky. How could the Hollywood producers be so careless in their conspiracy? In fact, there's a pretty mundane explanation. The camera settings weren't adjusted to capture them.