VIDEO: Bored Swedish Marines lip-sync 'Greased Lightning' in Afghanistan

Hey, it passes the time.

Soldiers know that life in the army can involve long periods of doing not very much at all, and the enemy can be boredom as much as the other guys with guns.

So what better way to ward off ennui than with a spirited rendition of 'Greased Lightning' from the 1978 classic 'Grease'.