It's my left arm that's strong. I'm ambidextrous by birth, but tend to favor my left hand after breaking my right arm as a kid. I had to use my left hand for everything, and even when the arm healed I never went back.
Also interesting, I couldn't snap my fingers until I was 18. I learned because Dr. Rodney McKay on Stargate Atlantis had a habit of snapping his fingers three times whenever he came up with an idea, and I started doing the motion to emulate him. Eventually, the snapping just started working.