What doesn’t happen is for some people “something that happened.” And it’s not just some physical accident that is the focus here. Encounters with others that “missed by a millimeter” also didn’t happen: Avoided or imagined arguments, for example. The problem for most of us is that we often pay attention to what hasn’t or won’t happen. It’s as though we seek anxiety, worry, and a rush of adrenalin. We can be addicted to nonevents that have no consequences.
Think in terms of measurements, real physical measurements, the next time you perceive a nonevent to be an event worth your concern. Missing by a millimeter is the same as missing by infinity.