I don't think anything can prepare you for what you're about to watch. This is a animated short film created by Sean Soong called SubWars, which as you will see was inspired by Star Wars. This is just a hell of a lot more bloody and violent.
The story follows an old man on a subway. No one will offer up a place for him to sit, so the old man goes ballistic with a light saber, bloodily slicing and dicing anyone who crosses him. It's extremely entertaining and what awesomeness is all about. This is probably going to be the coolest thing you see all day, so sit back, relax, and enjoy the complete badassery of an old man unleashing his fury!