One of the things that separates a good genre movie from a bad genre movie, I always think, ironically, is when you care about the people. The dime a dozen ones are where you don't have any awareness of the character.

Good genre movies are a little bit like trying to write a haiku. There are certain things that you have to do to fulfill the audience's expectations, but inside that, you have complete freedom to talk about whatever you want. Who wants to see a movie about gun violence in America and class? But, if you set it in this terrifying, fun, roller coaster ride of a movie, you can talk about whatever you want. That's been the game that genre movies play, when they do it well.

I was being taken around by a press agent at the Venice Film Festival at age 18. Was it fun? Sure. But it was a dangerous path to be walking on as far as having a substantive life. Because the casualty rate at the Venice Film Festival for 18-year-olds? High.

It's interesting to get older and realize that part of your job growing up in this profession is to help the next generation. More and more, with Boyhood and with Ellar Coltrane and with Emma [Watson], I start to see that role. There's no better way. Nobody wants advice, so you can't really give it. You just have to try to wish them well on their journey.

And the best films feel like a fist punching you in the solar plexus and all elements of the filmmaking process - the acting, the design, the cinematography, the music, is all working to one end.

Alejandro Amenábar is a very interesting filmmaker. I had really liked The Others, which was a movie he made with Nicole Kidman a few years ago. He made a very compelling case about how much he wanted me to be in this movie. Whenever a really passionate, talented filmmaker seems to have an interest in me, I take it very seriously because I like to work.

Oh, I like going down the rabbit hole. You know, that's kind of my job. When you play Macbeth, you gotta dive down that one. The trick is figuring out how to do it with love and a sense of humor so you can pop back out again. But, kind of the actor's job is to go down the rabbit hole.