On a recent flight, a controller instructed myself and another pilot of each other's position and had us make the required adjustments. The controller was quite jovial and introduced himself as "Bruiser," warning us that he didn't want to see a repeat of the incident that earned him his nickname.
A few moments later, the other pilot came on the radio asked Bruiser how he got his nickname. The controller chuckled and told us that he and another controller had both been looking down while walking toward each other in the hall once and had bumped heads. Bruiser received six stitches, and the other controller received four.
I couldn't help myself and asked how these controllers managed to keep airplanes apart. A second later, a Comair flight checked in at FL290, adding that he too was "a little nervous now."
Bruiser at the center didn't miss a beat. He replied, "Don't worry, fellas. I'm using my good eye today."