ESPN Magazine has a whole issue devoted to the Cubs. Among the stories is this one about Theo Epstein. It goes back to his days in Boston...
When Theo is mad, he likes to break stuff. Back in Boston, they all remember one night after a tough loss when he waved around a driver in the office. He set up a ball with the intention of crushing it down a narrow corridor, either into an empty office door or, better yet, shattering a window. With folks crowded around, he gave it a go, and the ball hit a concrete pole, then caromed at an impossible angle ... straight into the forehead of Ben Cherington, the VP of player personnel. They heard the moans first. Blood gushed from the wound. Minutes later, Theo went outside to meet Ben's irate wife, who'd planned on picking her husband up that evening to move stuff to their new house. "Don't be mad" is how Theo opened the conversation. Later, he signed the golf ball and gave it to Ben as a joke.