You can't imagine that making Steve Kean upset would have many repercussions for you.
However, on the opposite end of the spectrum, mess with the likes of Fergie or the Special One, and expect an entirely different response.
Managers can be terrifying at times. I'm certain that a halftime team talk from Sir Alex Ferguson would be far from pleasant, but there are some other managers who you would not want to get on the wrong side of either.
Let's delve into the Top 10.