Mauricio Pochettino launched a scathing attack on his Tottenham players after they were defeated 5-1 at Newcastle.
Spurs needed just a point against the already relegated Magpies to secure second place at the expense of Arsenal, but they capitulated in extraordinary fashion.
Pochettino's face told the story after the game, which even saw Newcastle go down to ten men due to a horror tackle on Kyle Walker by Aleksandar Mitrović.
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"They didn't care"
And the Spurs boss was furious with his players' mentality, even suggesting: "they didn't care".
Georginio Wijnaldum and Mitrovic put the home side 2-0 up, but Erik Lamela gave Tottenham the chance to get back in it with a superb finish from a tight angle.
However, instead to capitalise, Tottenham collapsed. Moussa Sissoko appeared to go down under minimal contact in the box, Wijnaldum putting away the spot-kick, before Rolando Aarons and Daryl Janmaat made it 5-1 with two goals in as many minutes.
What was most concerning was that Pochettino's side stopped running for the final goal, and failed to attack the ball for several of the others.
Their poor attitude did not go unnoticed by the manager, who made it clear that settling for third and sacrificing local bragging rights was not good enough.
"I think this was my worst day as a manager in England or Spain", he told the BBC.
"We need to be sure that never happens again and need to improve our mentality.
"We were on holiday and that is the reality."
He also revealed that Rafael Benitez "felt sorry" for him after the game, despite the Spaniard facing a spell in the Championship if he does stay on Tyneside.
Pochettino has urged his players not to concentrate on Arsenal this season, but it looks like they took his words a little too seriously on this occasion.
He was not alone in his disappointment, as Tottenham fans flocked to social media to vent their rage.
Spurs had consoled themselves with having achieved Champions League football, but next season will be challenging to say the least. On that performance, they have a long way to go if they are to compete at the same level when Chelsea and Manchester United get back to their best.
Was Tottenham's attitude to blame for the defeat? Have your say in the comments.