I wrapped a movie called 'Zombieland,' in which I was constantly under assault by zombies, then flew to New York, still very much in character. With my daughter at the airport I was startled by a paparazzo, who I quite understandably mistook for a zombie.
I suppose the reason why I like acting is because I'm curious about human nature, and the less I know about a character on the page, instinctively, in a way, the better.