Espnayol searched Barcelona stars that celebrate their Laliga title by turning on the sprinklers.
Goals from Lamine Yamal and Fermin Lopez they saw their bitter Catalan rivals beat 2-0 and they can no longer be caught by Real Madrid.
Tonight's victory comes two years and one day from then on Barcelona did exactly the same to win the title in the RCDe Stadium in 2023.
Barca stars celebrated that day on the field, but were quickly chased by Espanyol hooligans who tried to attack them.
The current boss Hansi Flick did not want the same thing to happen again and gestured immediately for his players to return to the dressing room as the full -time whistle went.
Yet many ignored their manager and various substitutes on the field to celebrate.
It made Espanyol players furious and there was a fight when Gerard Martin Pere seemed to push on the floor.
When Ronaldo Araujo and Jules Kounde at Flick Sloten in a rely on calmness, the sprinklers were called in to encourage Barca players from the field.
Although it did not work as Alejandro Bangde, Pau Victor, Andreas Christensen and Dani Olmo, but some dances under the unwanted shower.
In the meantime, Flick was noticed to push his coaches and players through the tunnel.
No Espanyol fans came to the field when the riot police stood in the way of their ultraslag behind the goal.
But many of them were not in their seats for the game in protest because they wanted to cancel the game.
Horror scenes outside the ground before the kick -off saw a car plowing in a huge crowd of fans.
Images shows a white vehicle opposite crowds while objects are thrown towards it.
The car then picks up speed and drives in people, with some hanging on the windshield while several supporters were injured.
Catalan police initially said that a female driver has lost control of her car and it happened to be.