Aperture: Lab Ratt is a fan film based on the Portal universe. And, as you'll see five seconds into this trailer, it's looking very professional.
Proper music, proper outfits, an expensive camera, good lighting... yes, it's looking lovely.
If it helps sell you on the quality behind this flick, it's being made by the same crew who put together last year's charming Aperture Science documentary.
This one, though, looks a lot more serious.
Oh, and bonus: the site of the production team also sells Aperture Science ID cards.