We sing a lot of the soundtrack in this film [Swiss Army Man] - me and Paul Dano - and on the last day of filming we had to just get into the back of our sound mixer's van and record a really crappy, rough version of the singing then. For some reason that was one of the most fun days.

You pick projects for the part, the director, and the script. I just want to do different, interesting stuff.

Because of the life I've had, I'd grown up quicker than most people.

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 think I'm always very naïve. With 'Kill Your Darlings' and 'Horns', I'm like, "Why wouldn't everybody love this?" But I guess it's going to divide people in some ways. But if you're willing to go with it and suspend your disbelief, you're going to get something amazing and something unlike anything else.

I had one relative who passed away but fortunately none others. So my sort of experience of it is quite limited, thankfully.

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