I doubt the car would even move if the driver stepped on the accelerator. In the picture, there are 20 men that you can actually see. Let's say each of them weighed 160lbs; even with just those 20 guys, that would still be 3200lbs pressing down on the car, more than double its own weight.
With next to nothing for torque, this thing would be lucky to move two inches with that kind of weight on it and no momentum to build on. Would still be funny to watch, though. Even the slightest jostle probably would've had everyone jumping off.