For Andy Grove, as described in "Only the Paranoid Survive" an inflection point is a time in the life of a business when its fundamentals are about to change.
For the rest of us it is the year you really didn't want to go to your parent's friend's holiday party, but they made you. You were 12 and all the other kids were 8, trying to put the mousetrap together but fucking it up and never getting around to playing the game. Too old to sit through "The Grinch" again and too young to get high and hit on your dad's boss's wife.
That was year everything changed.
This post is dedicated to my dear friend BP who always seems to bring out the best (or at least the funniest) in me.
Meeting him was one fo my life's best inflection points.