It must really scary when you're hangin' off the bonnet of a car and then, out of nowhere, some psycho rams up your arse and procedes to chase you like a psycho. Now, I've never been in this kind of situation myself, but I always thought that the way to solve this problem would be to have your friend stop the car then, really quickly, jump back in the car and speed off.
Why does Kim continue to drive and let her friend dangle for dear life off the bonnet of the car? Its like when people are running from trains in movies and they keep running forward when all they need to do is run to the right or the left.
The most obvious answer is that its "only a movie" and looks really cool but I thought that someone could come up with a more creative explanation.