Mathieu Flamini has stolen the show at White Hart Lane, scoring two goals for Arsenal over north London rivals Tottenham Hotspur.
The French midfielder, usually a reserve for Arsene Wenger, showed hitherto unseen strikers' instincts when he expertly followed in an Alex Oxlade-Chamberlain shot to pounce on a Michel Vorm mistake.
That prompted plenty of Arsenal fans to joke that they didn't need that striker they tried, and failed, to sign all summer.
But the best was still to come. Calum Chambers turned in a Nacer Chadli cross to make it 1-1 and Spurs were on top for a while.
Seemingly out of nowhere, Flamini latched on to a ball to volley home a superb strike past Vorm and put Arsenal on the verge of the fourth round.
Arsenal fans went predictably nuts:
Not sure if mathieu flamini or Paul scholes— McFarlane (@RossMcFarlane2) September 23, 2015
Who is that man and what has he done with Mathieu Flamini?— RY (@YoungEvariste) September 23, 2015
That moment when you realise Mathieu Flamini has more goals than Harry Kane this season— Taylor Mackenzie (@TaylorMack94) September 23, 2015
Mathieu Flamini is by far the best striker in the league. Get in!— Austin (@Frimponged) September 23, 2015
Mathieu flamini he scores when he wants!— Adamalamadingdong (@AdamBennell) September 23, 2015
Mathieu Flamini, our lord and savior— Triché (@xTriche) September 23, 2015
2 goals from Mathieu Flamini. The end is nigh...— Ross (@rossEFC95) September 23, 2015
Fucking Hell!!! Marco Van Basten...no it's Mathieu Flamini!!!!!— Haraam Genghis (@khn_akbar) September 23, 2015
THE GOAL MACHINE MATHIEU FLAMINI!— Alisha MacPhee ♥ (@GemOfABird4) September 23, 2015
NO WAY MATHIEU FLAMINI YOU GOD— ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ (@_Pjim) September 23, 2015
WHO IS THIS!? THIS CAN NOT BE MATHIEU FLAMINI— Gunnervision (@Gunner_vision) September 23, 2015
Is this the same Mathieu Flamini?— Chris Lower (@Chris_Lower) September 23, 2015
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