Garrysmod is a fun loving sex appea...I mean lovely appealing game with lots of humour and easily serverside modable. Sandbox of All Games. ^-^
So Cold by Breaking Benjamin
Half Life 2 Machinema
Did not use Garrys Mod for this to be created, but it shows off what can be done.
Also, I did not make this, I have a hunch it was the guys at LitFuse but I have absolutely no idea.