It is incredibly unheard of for figures associated with Arsenal to congratulate Chelsea for any kind of success.
However, on Saturday evening, a large number of Gooners posted tweets praising Olivier Giroud following the Blues' FA Cup final win over Manchester United at Wembley.
Antonio Conte's side failed to secure a Champions League position via the Premier League table this season as they finished fifth, but they ended the campaign on a high by winning a piece of silverware.
Giroud signed for the West London outfit from Arsenal in the January transfer window after falling down the pecking order under manager Arsene Wenger.
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The French striker spent five-and-a-half years at the North London outfit before signing for the Blues.
In most cases, it would be a controversial switch, but it seems that any anger that Arsenal fans initially felt has dissipated.
Many even felt joy for Giroud as he lifted his fourth FA Cup - the previous three he won with the Gunners.
It was a slender victory for Chelsea as Eden Hazard's first-half penalty against United was the difference.