Pep Guardiola often came across as a quiet, considered man during his time at Barcelona, especially when compared to his opposite number and nemesis Jose Mourinho.
Striker Zlatan Ibrahimovic wasn't exactly a fan of his meek approach to management, while he earned the nickname 'The Philosopher', in-part for his low-key demeanour.
However it certainly appears there is a angry streak to Guardiola which has rarely been seen before if this video is anything to go by.
Taking a training session with his Bayern Munich players in Doha recently, Guardiola lost his temper and was heard shouting: "Das passiert jedes f***ing Spiel!" - which translates to: "This happens in every f***ing game!"
Despite the fact that Bayern are top of the Bundesliga and looking strong in the Champions League once more, the Spaniard is evidently quite hard to please.
He even takes to the pitch to show some his millionaire superstars just how it's done.
Check out the video, courtesy of TZ.de, above!