Scoring three goals at the Bernabeu is a feat usually reserved only for the likes of Barcelona in 'El Clasico' and usually ensures absolute victory, but CSKA Moscow did just that, winning 3-0 but still going out of Europe.
Given CSKA already recorded a 1-0 victory over the current European champions at Luzhniki Stadium, they became the First team in 10 years to do a 'double' over Real Madrid in the Champions League since Juventus in 2008.
The 3-0 scoreline was also the heaviest defeat Real have suffered on home turf in European competition, and the first ever Champions League group stage home loss since 2009.
However, a 2-1 win for Czech team Viktoria Plzen in the group's other match against AS Roma consigned CSKA to a bittersweet last-placed finish.
So how did just an ordinary Russian side like CSKA manage to first achieve such a feat, and then still go out of the group rock bottom?
The Twitterati thought exactly the same, and responded with a torrent of marvelous memes and tweets to express their incredulity at the biggest double-shock of the Champions League group stage.
Play in #UCL Group G is now complete: Real Madrid loses twice to CSKA Moscow, still wins the group. CSKA Moscow beats Real Madrid twice, still finishes last
Roma through in second, Viktoria Plzen into the Europa League as a third-place finisher pic.twitter.com/Dig1duKub4
— Planet Fútbol (@si_soccer) December 12, 2018
Real Madrid 0-3 CSKA
—Real’s biggest home defeat in the Champions League
—First group stage loss at the Bernabeu since 2009