What would have happened if Gwynny caught the train? Her hair wouldn't have been brown, for starters! Sliding Doors is an unabashed, melancholic Gwynny vehicle, which isn't such a bad thing since she's so darn cute. The story, about a hapless Brit who we follow during two alternate realities -- one stuck in a loveless relationship, one striking out on her own, is fairly fun but wholly improbable. Which is why this is a romantic comedy-drama and not a flat-out drama (which would have just been depressing). The ending is not altogether satisfying, but it's certainly an original (though widely copied since).