If you're German-speaking, then cover your ears, because Bayern Munich boss Pep Guardiola can swear like a trooper in his adopted homeland.
Guardiola has masterminded another scintillating start to the season by the treble holders, leading them to the top of the Bundesliga, ensuring they reach the Champions League knockout stages and even winning the Club World Cup in Morocco last month.
But clearly that's because he doesn't let the standards drop for a second.
As translated by the Daily Mirror, Guardiola rips on his players in the video above, published by TZ:
Pep Guardiola can be heard shouting "Das passiert jedes f***ing Spiel" or "This happens in every f***ing game" before taking matters into his own hands and dribbling with the ball to show the Bayern superstars how it's done.
Of course, when you were as good a player as Guardiola was during his Barcelona prime, it's the sort of thing you can get away with. That and the cupboard full of trophies, of course...
But it does go to show that Guardiola is not merely the quiet, reflective type of coach that he is often portrayed as, and all top coaches need a ruthless streak.