It happens in every office. The same cast of characters, every single day, talking about the same things. Eventually, it gets boring.

NFL teams have this problem, too. And so, John Harbaugh, the Baltimore Ravens’ seventh-year head coach, had a solution: Take two of the NFL’s most competitive and, we’ll say it, crazy people and put them right next to each other in the locker room to create competition and drama.

“We...