Watch Your Head

Lately I've been thinking about how I never think about hitting my head while getting into a car.  Thousands of times I've just plopped into the seat, my head playing a high stakes game of limbo, where the bar would not fall harmlessly, but inflict great pain.  I don't remember the last time I did hit my head, but I probably have.  John McCain apparently did it in June of 2008.  What's amazing is that it doesn't happen far more often.  Sometimes I think I can almost feel the door frame just beyond my hair, yet no matter what type of vehicle I enter, appropriate avoidance adjustments are automatically made on the fly.  It's really pretty amazing.