In 2002, the advertising company Viral Factory filmed the “moontruth” video, which is a prank showing an “outtake” from the supposed faking of the “one small step” scene. The video shows “Neil Armstrong” (played by an actor) being interrupted by a falling studio light.
Flat-Earthers and other conspiracy theorists failed to realize that the video was just a viral prank video. It spreads in conspiracy theory circles as if it “proves” that the Apollo moon landing was faked.