Win the war and make big savings:
I was wandering around aimlessly at work the other day when I saw a group of co-workers watching a video of some war footage in Afghanistan. It was a good opportunity to be unproductive, so naturally I stood there and watched. The video was in black and white, and was shot from the point of view of the gunship as it fired explosive rounds at people. There was a little cross hair on the screen, and you could hear chatter of the pilot as he dropped the bombs.
Every time the pilot clicked the trigger button, it resulted in an explosion a few seconds later. They were literally firing thousands of rounds per minute, easily using hundreds of thousands of dollars in ammunition on people; not tanks, not turrets, not even jeeps, but people. So this gave me an idea: rather than using $100,000 worth of ammo, why don't we take $100,000, convert it to pennies, then drop the pennies on people instead? You could get 10 million pennies for $100,000, which should be able to fill at least 40 bags full of pennies. Thus we could drop bags of pennies more frequently than bombs, which could mean big savings for our military. Hell, you don't even have to drop them in bags to kill people. You could tape the pennies together 10 at a time and drop them from a height of 5,000 feet and kill damn near everything on the ground (and in a war on terrorism™, this is exactly what you'd want to do).