How does the flag flutter when there is no wind on the Moon?

Many people have e-mailed me to ask how is it possible that the Stars and Stripes appears to be moving as if blown around by the wind?

As we all know there is no air on the Moon and therefore no wind. Does this prove that the footage was not taken on the Moon?

Before you make a big mistake please check out the following link that shows that "to compensate for the lack of an atmosphere on the lunar surface, the flag assembly included a horizontal crossbar to give the illusion of a flag flying in the breeze "