I didn't know I wanted a full length feature film based on Portal until last night. That's when I first watched Dan Trachtenberg's mind-blowing seven minute short, Portal: No Escape. Now I can't stop thinking about it.
If you've never played Portal or its sequel, shame on you. But know that there are no real spoilers contained in the short, so you're free to watch. Even if you've never played Valve's first-person puzzler, you won't want to miss it. Also, go play Portal, you monster.