Jose Mourinho completely lost it after Marouane Fellaini scored the winner against Young Boys on Tuesday night.
The Portuguese manager was visibly frustrated with his team's performance on the night.
Marcus Rashford was guilty of missing two clear cut chances in either half.
And David de Gea was called upon to make a wonder save with 20 minutes remaining to make sure United didn't fall behind.
But, despite their struggles, Fellaini popped up in stoppage time to give United the victory.
All eyes quickly turned to Mourinho, who proceeded to kick over collection of water bottles and then slam another set down on the ground.
Watch the moment below:
That is some reaction. It was clearly an outburst of emotion and one that quickly went viral.
His actions brought about a lot of engagement, and a journalist has actually recalled some comments he made in January following the celebration.
In a dig against other Premier League managers, Mourinho insisted that he was 'much more mature' and that he doesn't act like a 'crazy guy' on the touchline.
“Because I don't behave as a clown on the touchline, it means I lost my passion," he said.
"I prefer to behave the way I am doing it, much more mature, better for my team & myself, I don't think you have to behave like a crazy guy on the touchline to have that passion.”
Oh dear, Jose. this is slightly hypocritical.
His actions on Tuesday night were anything but 'mature', as he claimed to be on the touchline in January.
Mourinho admitted after the game that his actions were brought out of relief but commented that he was not unhappy with the players.
"Relief. Frustration before that and relief with the goal," he said, per the Standard.
"I think we didn’t play for that, we didn't play for 0-0.
“We didn’t play to be in trouble until the last minute, so frustration. I was not unhappy with the players. Not at all.”