Paris Saint Germain suffered a 4-0 humiliation at already-relegated Grenoble on Tuesday four days before they turn out for the French Cup final.
With Gregory Coupet back in goal for the first time since injury back in November PSG tuned up for the Stade de France date with Monaco in the worst possible style.
PSG were undone by goals from Laurent Batlees and Nicolas Dieuze in the first half with Nassim Akrour and Daniel Ljuboja compounding the capital side's misery after the break.
Monaco, bereft of their number one keeper Stephane Ruffier who pulled out of the match suffering an injury when warming up, escaped with a come-from-behind 1-1 draw with visitors Le Mans.
With this depressing result, their 13th loss of the campaign, PSG must now look to Saturday and the Cup final to add some much needed cheer to what has been a season to forget.
Despite the satisfaction of claiming a big name scalp Grenoble's unlikely success moved them up to 19 points and prevented them becoming the worst ever team in the history of the French First Division.
That dubious honour is held by Lens, who mustered a mere 17 points in 1988/89.