31 Things You Probably Didn't Know About "Harry Potter And The Half Blood Prince"

Giant swings, work experience, and transfer tattoos.

Warner Bros. / BuzzFeed

1. Over 7,000 girls auditioned for the part of Lavender Brown.

2. The final seven had to improvise on screen with Rupert Grint over a period of five hours.

3. Jessie Cave, who eventually landed the role, said she wouldn't have minded if she didn't get the part because the screen test was exciting enough.

4. The scene in which Ron squeezes in between Ginny and Harry to break them up and offer them a pie had to be filmed more than 20 times because Daniel Radcliffe and Rupert Grint kept bursting into fits of hysterics.

5. Radcliffe was gutted that Quidditch reappeared in Half Blood Prince because it meant that he had to sit on a broom for five hours a day when they filmed match scenes again.

6. Grint, however, was delighted because he didn't get to play Quidditch the first time round.

7. He had to do a few weeks of stunt training before being allowed to film any scenes though.

8. A giant swing was used to send actors flying across the room for scenes in which Quidditch players fells off their brooms.

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