In the the late seventies and early eighties, I played background roles in thirty movies... Woody Allen movies, Scorsese films, you name it. Whatever was being shot in New York, I was doing stand-in and background work because I wanted to be close to the camera; I wanted to see what was going on.

One of the interesting things about 'Saw' is that you don't find out about things in sequential or linear order. One of the things that fans have liked a lot is, we don't forget about details. They come back and reveal themselves as the story evolves.

I try to think of acting in terms of thinking and doing. People think of it as, "Oh, let's get inside this guy." They think that acting is being, or feeling, or emoting. It's as much doing. One of the first things you do as an acting student is ask, "Can you say words and do a task at the same time, like sweep a floor?" You get to watch the human condition, and there's always a "doing" aspect of it. This couple, they're carrying backpacks, where are they going? Students? Or are they carrying instruments? It stimulates the imagination. So acting is doing ... and I forget how we got off on that.

No matter what kind of significance leads you do, you learn a lot from doing schlock. The setup's the same, only you have to work twice as hard to make it the best as you can make it. And a lot of acting is not about acting but technology. Are you standing in your light? Are you out of your light? And if the sound guy's near you, please don't put the coffee cup down at that moment, because you're covering your lines. All of that stuff's going on in your head, so you learn a lot by doing whatever. In my view, never worry that something's not prime - A, number - one stuff.

There's the moment in 'Saw' where I get up off of the floor at the end. That was shocking, because no one expects it. I thought they did that really, really well.

There are a lot of considerations that come into play when you craft one of these 'Saw' scripts, and there's only so much you can put into them.

I'm always amazed... I took my 11-year-old to an oceanography camp, and these girls came over to me, and my son was like 'Oh here we go, Dad,' because they had been looking. They were like, 'You're the guy, aren't you?' And I said, 'Well, maybe.' They said, 'He is, he's the guy on 'Charmed!''