Linux in Media

I know for a fact that a lot of Sci Fi original movies use Linux in their computer scenes (one of them was really, really, obviously Gnome desktop, which made me extremely happy). it's free, doesn't violate any copyrights, and allows the movie makers to customise the look of it so it can look suprar scientific. I wonder how much media actually uses Linux for their "fancy tech computer" scenes...or if most of them just use a flash movie or what...