I presume that this video has been making the rounds, but you gotta see it. Buzz Aldrin, the 74-year-old former astronaut, is being hounded by a moon conspiracy (i.e. the photos from the moon were fake) asshole, until he finally loses his patience and clocks the guy a shot.
The link also contains the Mythbusters episode that debunks the conspiracy claims.
Thanks to Captain Artie for the link.