CANNES, France -- Are you familiar with the Raoul Effect? Probably not, because it's a phenomenon that's known only to those people who've been to the Cannes Festival and watched films tendered in the official selection.

Someone, it's unclear who, screams "raoul" at the beginning of the daily 7pm screening in the Debussy theater. No one knows why. It's unclear who the author of the scream is, or