I'm going to push my friend out the window because he wanted some fresh air on the drive.
That seems mean. What makes you think it's acceptable to push your friend out of a car?
Because I think it's fun when people free fall.
Pushing someone from a moving vehicle is considered an assault with the potential to do great bodily harm. You should always practice highway safety when driving a car.
It's just a little harmless fun, don't take it so seriously.
But getting pushed out of a moving car is not harmless, he could get seriously hurt. It could also cause an accident with all the other cars on the road.