David Koepp quotes:

Forty thousand years of evolution and we've barely even tapped the vastness of human potential.

Johnny sort of popped into my head midway through the first draft, and he wouldn't leave. But the more I thought about it, the more it made sense. In the first half of the movie, this guy is in the house not doing anything. I really needed an actor who's inventive and who will make enough idiosyncratic choices to make it entertaining to watch. And let's face it, Johnny Depp could make a nap interesting to watch.