Yes, this is as awesome of a concept as it sounds.
Machine Gun Jetpack
I admit that there's no purpose to learning things like:
If I mounted a GAU-8 on my car, put the car in neutral, and started firing backward from a standstill, I would be breaking the interstate speed limit in less than three seconds.
That said, it is still good to know since the price of gas may eventually surpass that of depleted uranium shells. Not to mention the sharp decline in tail-gating.