Which Classic Science Fiction Movie Do You Hope Never Gets a Remake?S

Pretty much every movie you ever heard of is getting remade. They're doing an R-rated Weird Science reboot, which sounds like a terrible idea. But what's the one movie that absolutely must not be remade — either because it's too great, or because it's too awful?

Post your choice below — and as always, please include a picture. Thanks! Oh, and please feel free to include fantasy movies too — just couldn't find space for "and fantasy" in the headline.