This is the teaser trailer for Aperture: Lab Ratt, an upcoming fan film based on the Portal franchise. The people involved in this short film were the same who created Aperture: A Triumph of Science, one of the funniest unofficial videos based on Portal. This film in particular is excellent as it has a superb soundtrack and great production value. Additionally, many iconic elements of Portal are present so expect a lot of direct references to the first game in the series. It still hasn’t been confirmed when Aperture: Lab Ratt’s full version is going to come out, but in the meantime you can watch this quite professional-looking teaser trailer.