If proof were needed that football management is a stressful job then Pep Guardiola could be the perfect case study. Not only is he considerably balder and greyer than when he took over as Barcelona boss, he is now losing the plot completely.
While you could admire him for his revolutionary tactics, his own players were forced to rein him in on this occasion as he attempted to throw on a fourth substitute.
Cue much hilarity in the dugout and some head-scratching from Pep.
Spotted on The Offside