Nicklas Bendtner has recalled a bust-up with former Arsenal teammate Thierry Henry.
At the time, Bendtner was a youth player, but that didn't mean he held back when he experienced something unfair.
During an 11 v 11 game, Bendtner felt that Henry unlike himself was spared criticism, and so the Dane reacted.
He recalled on Offside: "Thierry and I played on each of our teams in an 11 against 11, and a mistake was made by him. It was overlooked by the coach, and I then made the same mistake, which was then called out, and in the meantime I had started to shout a bit and say that it wasn't quite fair.
"It wasn't quite in a calm way. There was a bit of expletives being shouted and so on, where Henry then walked across the pitch and just stood and shouted into my head and I shouted back a bit while the others stood and said: 'Nicklas, you just have to be quiet and that's now.'
"I learned a little there."