Places
The Whomping Willow
A magical tree whose branches strike anyone who comes near. It conceals the tunnel to the Shrieking Shack; pressing a knot on its trunk immobilises it. Harry and Ron crash the flying Ford Anglia into it.
In the books
Harry Potter and the Chamber of SecretsChapter: 5
Harry and Ron crash the flying car into the tree, which strikes back with its branches.