Emma Watson and Rupert Grint had bum casts made for their broomsticks.

Wait...a bum cast?!?

That's right, the Harry Potter stars had casts of their behinds made to help make shooting flying scenes easier. 

"[The broomstick is uncomfortable] even for girls, so I can't imagine what it's like for guys."

For his part, Rupert says flying...

 "It's like this ride they put you on on this broom. It's not the most comfortable thing I have to say. They made this little seat for me so they took this mould of my chair area."

As for other brushes with danger, Grint explains his recent bout with swine flu.

"Yeah I'm over it now. It was just swine flu but it was just like any normal flu - I just had a sore throat and was in bed for a while."

Thank goodness he said he had already filmed the scene in the next film in which his character kisses Hermione before he got ill.

On the kiss, both co-stars were less than excited.

He said: "We weren't really looking forward to it really if i'm honest."

While Emma went on to say:

"It could potentially sound as if we are putting each other down, but actually we are both in the same boat and we both thought it was a horrible thing to have to do because we are just like brother and sister really. It was really weird."

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