Gennaro Gattuso's Napoli came crashing back to Earth after Lecce earned a stunning 3-2 win at a disbelieving Stadio San Paolo.
Three wins on the bounce, including a 2-1 victory against Juventus, appeared to suggest that the tide was turning in Southern Italy in what has been a very difficult season for Napoli.
However, Lecce were not interested in Napoli's recent upturn in form as they secured their most impressive result of the season.
In a dynamic performance, Lecce were able to soak up pressure for extended periods and attack with real conviction, despite Napoli's bright start to proceedings.
A neat back heel by Arkadiusz Milik, which ultimately led to a missed header from Lorenzo Insigne, was indicative of the home side's confidence, with another supreme passage of play seeing Piotr Zielinski glance wide - when he really should have scored - a Marco Rui delivery.
The hosts were left to rue not capitalising on their early dominance as Lecce scored with their first attack.
Industrious play down the left by Filippo Falco set up a snapshot for Riccardo Saponara which David Ospina could only push into the path of Gianluca Lapadula for a tap-in.
It was harsh on the Neapolitans as they were made to pay for their profligacy. Gattuso's men immediately attempted to respond and came close to an equaliser with the dangerous Insigne hitting the post.
After the break, Gattuso called for reinforcements, bringing on Dries Mertens for the ineffective Stanislav Lobotka. It led to an immediate reaction as the lively Milik struck three minutes after the restart. It was an immediate reward for the manager, Mertens playing the key role in finding the Polish striker in a swift Napoli move.
While Napoli were dominating, Lecce still posed a threat. The Salentini were rewarded with a second after sharp passing led to a double for Lapadula. It was the striker's eighth in Serie A and his goalscoring will be vital in determining if Lecce can avoid the drop.
Lecce netted a sublime third when substitute Marco Mancosu struck a 30-yard free-kick that smashed in off the post. Napoli were rattled and unable to continually apply pressure to the opposition defence.
Gattuso's side did persevere until the final whistle and managed a consolation strike through Jose Callejon in added-on time, but it was too little, too late.
The result gives Gattuso much to ponder as he attempts to rectify what has been an extremely underwhelming season in Naples. A better performance will be needed when Napoli face off in the first leg of in the Coppa Italia Semi-Final against Antonio Conte's Inter.