Twice The Pleasure: Museum Of Moving Image's "The Cinema And Its Doubles"

David Lynch's Mullholland Drive was originally a TV pilot, but when it wasn't picked up, he re-wrote it and added more scenes:

That Obscure Object of Desire by Luis Bunuel has two actresses playing one woman:

Jeremy Irons plays twin gynecologists in Dead Ringers:

The ultimate film about doubles and obsession, Vertigo:

Brian DePalma's Femme Fatale is underrated and over-the-top: Rebecca Romijn and Antonio Banderas, plus a plot involving a jewelry heist, gangsters, and the American ambassador!

"I am Jack's complete lack of surprise"—Fight Club: