Pretty much the question itself
In: Physics
A moving car is essentially moving all its content inside of it, along with the air.
If the car suddenly stops (in a car crash for example), its content will keep moving forward, until stopped by something that is still; because the crash starts with the car exterior entering in contact with a still obstacle, things that are directly connected to it, will also stop moving first.
Because the driver is not solidly attached with to car, his body will keep moving, while the steering wheel will stop, resulting in collision (which is why we created seatbelts).
A bee flying inside the car has initially been pushed by the air inside of it, and stays moving along with the air transported and displaced by the car. If the car suddenly stops, the air inside will not stop the bee from moving because it is not hard/dense enough; so the bee will certainly move, and might hit the front window if the car was moving fast enough.
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