A fan in the Feyenoord section trolled Marseille supporters by unveiling Paris Saint-Germain merchandise and celebrating wildly in front of them during Thursday night's five-goal thriller.
Feyenoord beat Marseille 3-2 in the Europa Conference League semi-final first leg at De Kuip, with the second strike from Cyriel Dessers ensuring the Dutch side take a lead to France for the second fixture on 5 May.
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Luis Sinestra was the other goalscorer for Arne Slot's side and put the Rotterdam outfit 2-0 up in the 20th minute.
And the goal helped bring about a viral clip on social media as a supporter in the Feyenoord section goaded Marseille fans with such disrespect.
Separated by glass panelling, the fan got as close as he could and showed off a PSG tracksuit top.
PSG are Marseille's main rivals in Ligue One and the two sides play out the 'Le Classique', which always seems to get seriously tasty on and off the pitch.
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It's unclear whether the fan is a PSG fan or a Feyenoord follower but he repeatedly patted the badge on his chest and riled up the opposition supporters.
They were going absolutely mental on the other side of the glass, banging on it and dishing out middle fingers galore.
A steward did his best to restrain the fan, who eventually stepped away back to his seat and continued to rub it in from there.
Marseille pulled level in the second half courtesy of goals from Bamba Dieng and Gerson but then Dessers bagged his brace straight after half-time.
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The two sides will meet again next week at the Stade de Velodrome and we just hope that the fan in question - if he's in attendance - is armed with a disguise.
The other semi-final between Leicester and Roma was 1-1 and is nicely poised for the second leg at the Stadio Olimpico.
Topics: Feyenoord, Marseille, Paris Saint-Germain, Ligue 1, Europa Conference League