Jose Mourinho's final whistle spat with Antonio Conte after Chelsea's 4-0 victory over Manchester United will be seen by many as a case of sour grapes.
The Special One was reportedly upset by his Blues' counterpart's wild celebrations on the touchline and his attempts to rile up the crowd with his side already in firm control of the game.
It's fair to say Mourinho is no stranger to touchline antics, and when his teams are winning, he's never been afraid to make his feelings known.
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Yet, he clearly didn't like it when the boot was on the other foot, hence why he appeared to give Conte a good talking-to as the pair shook hands before retreating down the tunnel.
As always, Mourinho's actions have divided opinion. Conte does irk some with his over-the-top behaviour, but it's also one of the reasons he's quickly become so popular in the Premier League.
At the very least, the United manager has the backing of Vicente del Bosque, who was on the receiving end of the famous Conte craziness not too long ago.
His Spain side were knocked out of the Euros by Conte's Italy, and it looks like the scars of that 2-0 defeat haven't healed yet - as Del Bosque still clearly has a bone to pick with his old international rival.
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"In that particular instance, I think Mourinho acted correctly with Conte," Del Bosque said, per Marca.
"I believe Conte should be more moderate in his celebrations.
"I'm not saying to be as boring as I am, or not to be happy, but for him to be a bit calmer."
Conte's never going to change though, is he, and why should he? Chelsea are finally looking like title contenders again after three wins on the bounce, so it's no wonder their boss is getting a little carried away.
Del Bosque is no longer in charge of Spain anyway, but as long as Mourinho is in charge at United and Conte at Chelsea, we could well be in for a long feud between the pair.
Should Conte tone it down on the touchline? Is Mourinho just as bad? Have your say in the comments.