Hey, he wasn't just a mathematician, he was also a computer geek. I used to see him back in the early 80's in the middle of the night in the Princeton computer center, wandering around with a deck of punch cards for the IBM mainframe.
I was playing Frisbee in a field with some friends, and it started to drizzle. Professor Nash walked by, and laid down on a bench under a tree. He folded his hands together, closed his eyes, and looked really placid, but we could see that he was thinking about something.
You know that saying, "A penny for your thoughts?" I would have paid a fortune to know what he was thinking about!