King Kong was difficult only because of the hours we had to put in. At that time, there was no protection for actors about time or anything. We worked straight through for 22 hours once on Kong. It was really a wearying experience, because it was mechanics, really, as much as anything that we were dealing with. The technicality was transparency to transparency from the rear, and then re-photographing me in the foreground on the same level with that screen-so I couldn't really see what was happening at all! It had to be done many, many times to confirm that it was okay. So we worked for 22 hours!