Man is it ever weird. My wife just had her birthday and I'm running late picking up stuff so I'm racing around in my car with this helium ballon. The damn thing moves completely opposite of what you would expect. When you accelerate it moves forward when you brake hard it goes back. It even leans in to corners. I thought I was going nuts but it's apparantly one if Einstiens crazy physics theories. Any one care to explain. Also I recomend next time you pick up a ballon to race around with it in your car.