How often do you let other people’s nonsense change your mood? Do you let a bad driver, rude waiter, curt boss, or an insensitive employee ruin your day? Unless you’re the Terminator, for an instant you’re probably set back on your heels. However, the mark of a successful person is how quickly she can get back her focus on what’s important.

Sixteen years ago I learned this lesson. I learned it in the back of a New York City taxi cab. Here’s what happened. I hopped in a taxi, and we took off for Grand Central Station. We were driving in the right lane when, all of a sudden, a black car jumped out of a parking space right in front of us. My taxi driver slammed on his brakes, skidded, and missed the other car’s back end by just inches!

The driver of the other car, the guy who…