Ever tried to finish a game as quickly as humanly possible? Not like this, I bet.
Speed runs are all about completing a game as quickly as possible by exploiting loopholes in the physics of the game world.
This one is a run of Half-Life 2 completed in 1:27:51 -- a time that the runners are calling a world record.
Record or not, it's bloody impressive. Imagine how much you'd have to play to get this good?!