I recently had a new suit tailored and was surpised/amused to learn that my right arm is 1/4" longer than my left (this hasn't been the case when I've been measured in the past). My guess is that I was out of alignment from my habit of sitting slightly diagonal to my desk and reaching for my mouse with my right hand for much of the day.

I'm already much more of a keyboard guy than a "mouser" (as I'm sure most HNer's are) -- but I'm switching to a standing desk next week and correcting my bad habits. I'm to young for this!...