Okay, so Harry and Ron are trying to come into a landing at Hogwarts but they flying car is not cooperating.
Ron tries to use his wand but it snaps in half. Uh-oh.
They end up crashing right into the branches of a huge tree on the Hogwarts grounds. It's the Whomping Willow.
Suddenly, the tree starts pummeling the car (now we know how it got it's name). The car manages to fall to the ground and Ron starts it again and drives out of the range of the tree before it can bash them one last time.
By this time the Ford Anglia has had enough. The car ejects Ron and Harry along with all their luggage. Then it rides off past Hagrid's hut and into the Forbidden Forest.
Mr. Weasley is not going to be thrilled about this.