It's not an ad for the BMW E30, it's lightsaber-wielding viral brilliance. BMW wishes it could come up with a campaign this cool.
So if it's not an ad, then why are we calling it an ad? Well, everyone knows that E30s are the de rigueur vehicle for aspiring car nuts/nerds/young people in general. This video just cements their reputation.
Oh, and if you don't get the joke, watch this video too.