I like the idea of being a youngish parent. So I've got energy to play football even though they'll be better than me by the time they're four.

I've done seven movies in eight years, and with each movie I feel like I'm learning a lot. I'm still young-ish, so I still feel like I'm in the zone of learning and creating. Those are the perfect places to do that. And in a weird way, you have a lot of freedom.

I have described myself as being 'gently eccentric.'

There is always this thing of will you get too old for your part? But people are playing a lot younger than they actually are in real life. I don't think it's as big an issue as a lot of people are making it out to be.

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 was very sad to leave Harry Potter but equally there will be an element of excitement about the idea that a script might come in and I don't have to go: "I'm sorry, I'm kind of busy for the next four years." The idea of that is quite exciting.

The paparazzi were outside the theatre every single night, but we came up with a cunning ruse. I would wear the same outfit every time - a different T-shirt underneath, but I'd wear the same jacket and zip it up so they couldn't see what I was wearing underneath, and the same hat. So they could take pictures for six months, but it would look like the same day, so they became unpublishable. Which was hilarious, because there's nothing better than seeing paparazzi getting really frustrated.