Rules? In a knife fight?

My favorite Paul Newman movie is Butch Cassidy and the Sundance Kid. Primarily because it would do if I could only quote one movie for the rest of my life. :-)
Butch: What's the matter with you?
Sundance: I can't swim.
Butch: Are you crazy? The fall will probably kill you.

Just keep thinking, Butch. That's what you're good at.