Sound effects

I'd heard about this rumor, but had not seen it in print until the September issue of Premiere. I've taken the liberty of re-creating the desired blurb effect.

Ewan McGregor and Hayden
Christensen are motormouths.
During filming of Revenge of the Sith,
whenever the two actors began
sparring with Obi-Wan Kenobi and
Anakin Skywalker's lightsabers, they unconsciously would begin making whooshing noises -- like they were kids playing with toy lightsabers. George Lucas instructed them to stop moving their lips. Whooshing sounds, he noted, could be added in postproduction. Unfortunately, so could Jar Jar Binks.