I think Harry Potter's very important. Every opportunity I will get for the rest of my life, I would not have got if it wasn't for Harry Potter. And it would be height of ingratitude if I was ever anything but proud to be associated with these films.

Just keep acting is my plan, I just want to keep going for as long as I can. I've had a fantastic time on Potter, I will be very sad to leave it because every time I look back on one of these films, every scene I watch will be forever linked to a memory of what happened that day or something that was happening around that time in my life.

I would say I was challenging the system quite. But I like to think that if the choices I make are slightly unexpected or challenging to people, then that is good. We are definitely three fairly like-minded people in terms of what we value in scripts and in storytelling.

I think, as an actor, and particularly if you are playing the lead in something, you have to view yourself as the head of department for the cast. All of the other departments are accountable and have somebody at the helm who is leading them all the time, and I don't think that the actors should be any different.

There were some parts of the film [Swiss Army Man] that the Daniels [Kwan and Scheinert] really wanted to look as elegant as a piece of ballet. As Hank and Manny go on in the story, they get better and better at being with each other and more and more adept - Hank knows more and more what Manny's going to need at any given point, and having that choreography helps a bit.

I'm the only kid in the world who doesn't want an eighth Harry Potter book.

How irritating it must be for people, to be bombarded with me!