Jose Mourinho acted exactly as you'd expect upon his second return to Chelsea as Manchester United manager.
Having lost 4-0 to the Blues back in October, the Portuguese boss was out for revenge in the FA Cup quarter-final.
Those hopes were dashed thanks to a combination of Ander Herrera's sending off and a rare goal from N'Golo Kante.
It was the red card that set the tone for a feisty encounter which got the best out of Mourinho.
As Chelsea fans chanted "f*** off Mourinho", he raised three fingers at them, a reminder of the number of Premier League titles he won at Stamford Bridge.
Later, he was involved in a touchline spat with an animated Antonio Conte having appeared to kick the ball at the Italian.
This was a throwback to the Jose Mourinho of old. Disappointingly, the 54-year-old has mellowed a little since taking the reins at Old Trafford, but this was akin to his classic feuds with Arsene Wenger.
Why he didn't shake Conte's hand
At the final whistle, he had a chance to patch things up with the customary post-match handshake, but he didn't do that either - though he has now explained why he didn't deliver the gesture.
"I didn’t because I thought my players deserved my action immediately and our supporters also deserved our thanks to them, so it was that," he said, per United's official website.
"I can promise you that if I see him out there I will shake his hand. I have nothing to speak with him at all, but to shake his hand, for sure I will do that.”
You get the feeling that this is a rivalry that could go on for a long time.
It's understandable that Mourinho was frustrated. Despite his pretences that he doesn't care about the FA Cup because it won't get United in the Champions League, he'd surely love to have beaten his old club.
The Herrera red card was particularly contentious too, though it has to be said that Chelsea were the better side overall and deserve their place in the last four.
And United weren't entirely innocent, as it became patently clear that the Red Devils had been instructed to target Eden Hazard.
There may have been just the one goal, but there was plenty of entertainment on the sidelines.
Who will be more successful long term - Mourinho or Conte? Have your say in the comments.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: https://www.givemesport.com/writeforgms