Yes, Dave Bayer. I was the math consultant, but it's like joining the circus, once inside you do what you can. For one example, when I was a kid my Mom left out a Time Life book on drugs, and my brother and I were fascinated by the various photographs of spiderwebs made under the influence of different recreational drugs. That idea helped shape the "mad shack" in the film. I was also Russell Crowe's hand double, and I had a speaking part in the pen ceremony.