Mess with the Bull and you get the horns. That's also true if you're not messing with the bull apparently.
This took place in Brazil earlier this year, but it's making it around the internets now. In this security cam footage, you see a wild bull attacking a parked car, head-butting it and even moving it several feet in a few directions.
Its funny to watch the other cow in the clip. I imagine it was thinking "What did that car do to you?"