Maybe it was the shock to the system of a humbling 3-0 defeat to Wolves midweek?
Or maybe, it was the return of captain Scott Parker in time to inflict a 2-0 defeat on Derby?
But whatever it was, this was the best performance by Fulham in 2015. They outplayed, and outfought the league leaders, scored twice courtesy of a debut goal for Nikolay Bodurov and Cauley Woodrow, even if there was a mixed injury news for boss Kit Symons.
His counterpart was in no doubt, this was Fulham's day.
Steve McClaren added: "This is a Premiership club, with Premiership players, and they fought for their lives throughout."
Here is a terrific match gallery of just how hard they fought.