Cristiano Ronaldo loves nothing more than embarrassing his Real Madrid teammates with tricks and flicks during training.
How many times have we watched the Portuguese celebrate wildly after nutmegging the likes of Pepe and Sergio Ramos, whether it be with a backheel or elastico?
A lot - that's how many.
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However, put the shoe on the other foot and it's an entirely different matter.
Ronaldo hates being upstaged by anyone, so when Danilo nutmegged him in a rondo during today's session (see below), he reacted furiously and quickly threw his toys out of the pram.
Arms raised and with a frustrated expression on his face, anger quickly got the better of the former Manchester United winger as Marcelo laughed and celebrated at his expense.
It was at this point the Portugal international lost it. After arguing with Marcelo and winning back possession in the rondo (0:39), Ronaldo leathered the ball straight up into the air before firing it at the press box.
He then pointed and said something to whoever he may have hit.
It's little wonder Ronaldo reacts so badly to being outclassed considering he claims to be the "best player in the world".
He told La Gazzetta dello Sport, per Goal: "In my head, I am the best player in the world.
"I am working very hard every day with the ambition to be the strongest. It is then up to others to judge me.
"I always want to improve myself. I am very motivated and I believe that is the key behind my success on the pitch."
Having recovered from his knee injury in the Euro 2016 final - not to mention the four goals he scored against Andorra recently - Ronaldo believes he's finally back to his best.
"I suffered a serious injury [in the final at Euro 2016] and missed two-and-a-half months," he added, "but I am feeling well now.
"I am back to my usual best and I am ready to enjoy another spectacular season."