The fastest-selling screening at the annual Palm Springs International Film Festival requires a solemn vow - the Secret Screening. It's a film presentation so secret that audience members are asked to sign a promise that they won't talk about the film until it's released theatrically.
"We sell out every year in advance," said the film festival's artistic director, Helen du Toit. "It's like a grab bag. Nobody knows what it is until the credits roll. They love it."