Here’s the famous footage of the Apollo 15 astronaut that dropped a hammer & feather on the moon to prove Galileo’s theory that in the absence of atmosphere, objects will fall at the same rate regardless of mass.
There has been much debate over the years on whether this footage is real, or was faked in a studio. Decide for yourself!
Update: Here’s a link to the NASA site, of some photos taken by the LRO (Lunar Reconnaissance Orbiter), of various Apollo mission landing sites on the Moon: http://tr.im/LRO_apollosites
Of course, it will probably be argued that these can be faked too. Here is an Astronaut dropping a feather and a hammer on the moon. That is all.