Maybe it was the recently rare sight of west London sunshine, but as Sunday's final day festivities progressed, part of Stamford Bridge seemed to have lost its mind.
With a chorus of 'Stand up for the champions' Chelsea , last year's focus of that ditty, passed the silverware onto Leicester – football's fairytale made real.
Even considering the momentum of public goodwill that has built-up behind Claudio Ranieri and his side, this was an unusual show of affection for a club that is not far behind Millwall or Leeds in its delight at being a public enemy.
But, from the off, this was a love-in of the sort unseen by Chelsea-watchers since the pre-season visit to Ibrox a few years back.
Leicester <hearts> Chelsea – because they held Spurs and brought them the title.
Chelsea <hearts> Leicester – because... well, because they held Spurs and brought them the title.
But, in addition to all the reasons shared elsewhere – the love of the underdog, the boy's own Jamie Vardy story, the pizzas for players and doughnuts for fans – Chelsea had another reason to send waves of goodwill to the away end.
Dilly dong.
Ranieri was welcomed in person to the Bridge by Roman Abramovich – a courtesy not extended to many of the managers the Russian has sacked at Chelsea.
And he was presented, on -pitch, with a token to mark his years with the club.
Often derided back then, and generally looked upon as a bumbling old comedy act, time has been kind to Ranieri's Chelsea legacy.
Petr Cech, Frank Lampard , William Gallas, Claude Makelele – these were all Ranieri signings.
And the day's other main focal point, John Terry , was first made club captain by the Italian.
When the crowd regained their composure, and stopped serenading the supposed enemy, it was to Terry they turned.
'We want you to stay' was the message – sung loud and clear, not just on the 26th minute to mirror his squad number, but throughout.
A touted walk-out – a concept that completely misapprehended the culture and traditions of Chelsea Football Club – received the contempt it deserved.
If anyone did walk out, they were neither noticed nor missed in doing so. A far better display of support for the Captain, Leader, Legend came in the form of a huge banner bearing his image – unfurled from the Shed End.
Lost beneath all of this emotion, there was actually a football match.
Two goals – one apiece – and all left happy.
Guus Hiddink , in his final game, finally paid at least some heed to the call for youth opportunity: introducing Ruben Loftus-Cheek, Tammy Abraham and Fikayo Tomori as second half substitutes.
Hiddink, officially retiring from management, was later asked if he might be tempted back: joking that if Chelsea had to give him a call in December, then it would mean very bad things for the club indeed.
The final whistle blew, the visitors partied, and people – again, despite threats to the contrary – stayed to see Chelsea's worst performing team in 20 years parade around the ground.
In truth, Terry was the carrot here and he tearfully told those who remained that he wanted to be nowhere more than where he was right now.
But he pointedly stopped short of saying whether that would actually happen.
And then everyone made their way to the pub, to the restaurant, and finally to home and bed.
Another season over. This time one that ended like none has done since... well, ever.
Up in the gods Abramovich, enthusiastically applauding to the end, had a look on his face that said far more than his physical actions.
It said: “This must never be allowed to happen again on my watch.”
