To be honest I think this is the kind of thing that top level players completely switch off from.
It's good if you're a massive legend of the game managing a very young squad who've never seen you angry before, but it's got a very short shelf life. United players used to laugh behind Ferguson's back when he was giving the hairdryer because they're elite professionals, they don't need to be shouted at, they just want instructions in how to fix issues in the game.
That's why the most we've ever seen from Pep is the "Sit down, drink water, relax". Most of the time he doesn't even go in the dressing room, and when he does it's to give instructions or show clips to explain what's going on.
Last week the media kept asking about what Pep said in half time at Spurs, obviously hoping for some epic story about how he tore them a new one and turned everything around, but both Stones and Gundogan have said he didn't really say much, it was the players being introspective and knowing they could do better.