I'm 5-foot-5, and I'll wear a big parka and put the hood up, and nobody gives me a second glance.

I think being on a film set for such a long time made me a technical actor without realizing it.

If I die on a film set when I'm 80, I'll be happy with that.

If I can make a career for myself after Harry Potter, and it goes well, and is varied and with longevity, then that puts to bed the 'child actors argument'.

For ages, in my lunch hours, I would just go round and choreograph fight scenes. For fun. So now I'm very good at being thrown around. I bounce, in the words of my friends.

Paul [Dano] was amazing at carrying me around [in Swiss Army Man]. I wanted to be there as much as possible but didn't want to hurt Paul's back, but Paul often chose me over the dummy many times on the set. But yeah, to be honest, a little bit of preparation I did with my friend in my flat could never have prepared me for quite the level of physical reliance we would have on each other.

I basically have the diet of a 19th-century Irish navy, apart from the litre of stout a day. It's meat and potatoes and bread and cheese: those are my four food groups.