http://www.cbssports.com/nfl/eye-on-...hing-jim-kelly

"Well, [Kelly] was doing a game in San Diego, and I wanted to ask him where he was coming from with those comments," Harbaugh explained. "We went into a room and started talking about it. He said, 'I call it the way I see it.' One thing led to another. I hit him. I threw a couple of punches. Sometimes you have to stand up for what you believe in."

After the punch, Harbaugh knew right away that something didn't feel right.

"I broke the bone while hitting him," Harbaugh said in 1997.