Sheffield Wednesday inflicted a 3-0 defeat on Premier League side Arsenal, with key players delivering big performances all over the pitch.
One of the star men was centre-back Tom Lees, who dominated France international Olivier Giroud - who netted against Bayern Munich one week earlier, and Everton at the weekend.
Lees' performance drew not only praise from Sheffield Wednesday fans, but from supporters of his former club Leeds United - who let him go on a free transfer.
The defender did not play well for Leeds during his final few months at the club, and letting him leave had logic at the time, but the way the 24-year-old has turned his form around has been outstanding, and the decision to let him go does not look so smart now.
Lees of course seemed to struggle amid the instability and pressure at Leeds, and given what has gone on at the club since he left, with numerous managerial changes, and changes in player personnel, he may have continued his downwards spiral.
That possibility did not change much of the bemusement among supporters at seeing him look so composed and in command in Sheffield Wednesday's televised victory over the Gunners.
The Owls are in a good moment at present, sitting inside the top 10 in the Championship and unbeaten in their last seven in the league, and now having knocked off two top flight teams in the Capital One Cup.
Lees has been an instrumental part of that, and Olivier Giroud will be glad he does not have to play against him regularly.
Here is a look at how Leeds fans reacted to their former player's display...
Tom Lees is a different player now he's left us, he hasn't given Giroud a sniff that half. We're great at destroying at centre backs #lufc— Tommy Ellam (@Ellam9) October 27, 2015
Tom Lees dominating Olivier Giroud brings a tear to my eye.— Steve Evans (@BigSteveEvans_) October 27, 2015
Tom Lees has been outstanding tonight and rated as one of the best CB outside the EPL. Yep, we let him leave on a free. #LUFC.— RightInTheGaryKellys (@RITGK) October 27, 2015
Is Tom Lees taking something illegal? He's been unreal for Wednesday— Danny Halford (@DannyHalford96) October 27, 2015
Scrolling through the LUFC hashtag, everyone moaning about selling Tom Lees. Not one of you complained when he was sold, not one.— Leah. (@leahlufc) October 27, 2015
Tom Lees playing like a world beater. We let him go and replaced him with an Italian liability. Nice work Massimo. #lufc— Stu Bamforth (@StuBamforth) October 27, 2015