Juventus coach Antonio Conte admits he can lose his rag with his players.
Andrea Pirlo is releasing his autobiography in which he reveals Conte often throws plastic water bottles at the locker room wall at half-time, even when they are winning.
"It is true, I sometimes get angry even during a victory. If there are constructive and convincing victories, then I'm happy. At times a win arrives with luck or other people's mistakes, so those results leave you with three points, but also regret and anger.
"If a Coach were to be happy in these situations, then it would be bad for the team, because it'd prepare them for other defeats.
"A Coach in the 21st Century cannot be wrapped up only in tactical discussions, but must also be a motivator. He has to press the right buttons and find the best way to confront every individual. Some players might need a nice compliment, while others have to be challenged with toughness.
"It is not easy to get inside the mind of every player, considering a squad has at least 25. A good Coach spends his time studying and keeping up to date with every aspect, because he wants to become the best.
"Every Coach has his own mentality. I hope that mine is a winning mentality. The statistics and our consistency suggest that is the case."