I'm not sure how I missed this back in August, but it's splendid enough to warrant a belated post on a Saturday. The two men of Corridor Digital have been creating extraordinary movie shorts for years (one of my all-time favourites being The Glitch), primarily based on videogames, featuring extraordinary special effects that rival those of big budget Hollywood studios. Certainly their profile is a lot larger in recent times, and their work is now very often paid for by the publishers of the games they're recreating. (This live action video of Rayman Legends (no, really) being one of the most bizarre.) However, they still create projects for their own entertainment, and their origin story for the Gravity Gun is absolutely stellar.
Created for YouTube's Geek Week, this is a short film showing how Alyx first built the Gravity Gun. And, well, it's epic: