Zlatan Ibrahimovic appeared not to have received the memo explaining Paris Saint-Germain's encounter with Chelsea was supposed to be a 'friendly', as the French champions' captain left one on opposite number John Terry.
The spoils were shared after 90 minutes in North Carolina, with Chelsea eventually triumphing 6-5 on penalties thanks to fine strike from goalkeeper Thibaut Courtois, yet it was the clash between the two skippers that transpired to be the biggest talking point.
With 20 minutes on the clock during this Champions Cup meeting, Ibrahimovic and Terry vied for a loose ball that had come as the result of a failed Chelsea corner, and the centre-back copped a sizeable clonk on the head for being as bold to challenge the Swede.
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Terry was successfully able to hold off Ibrahimovic after the striker clipped the ball into open space beyond the Chelsea defender, only for the latter then to plant a flying elbow on the back of his head with apparent intent.
It was an inexplicable moment of madness from Ibrahimovic, and one that went unpunished from the referee. Were this to have happened in a competitive game, Ibrahimovic would surely face a significant suspension courtesy of retrospective action.
Perhaps this was Zlatan's way of getting back at Chelsea after he had been sent off when the two sides met in the Champions League last 16, with the behaviour of the opposition players attributed as a key influence on the decision of the official that evening.
PSG did, however, go on to triumph against the odds thanks to goals from David Luiz and Thiago Silva - but this was an opportunity for Ibrahimovic to get his own personal redemption.