Half-Life – Singularity Collapse is an impressive Half-Life 2 fan movie which you can see below. It’s a first-person movie, and features quite a bit of the protagonist looking at his hands, for some reason. Fortunately it’s also heavy on the action, including a Highway 17 style buggy driving sequence, which is particularly awesome. It’s not short on the special effects, either, with a bonkers hi-tech reactor sequence, explosions, HUD weirdness, and lots of explosions and gunplay. Worth a watch, I would say.
I’m consistently amazed by the effort that gets put into this, especially so long after Half-Life 2 came out. The fandom is still strong with this one.