Tottenham fans will never forget November 1, 2017, for as long as they support the club.
Real Madrid have been in poor form all season but few expected an impressive Spurs side to take Los Blancos apart in a 3-1 romp at Wembley Stadium - and it was just that.
Zinedine Zidane's men looked toothless off the back of their disappointing 2-1 defeat to Girona and Tottenham took full advantage with the brilliant team play that unravelled Liverpool.
Cristiano Ronaldo eventually salvaged a consolation goal for the visitors but executed another nondescript performance punctuated with dead-end runs and uncharacteristic errors.
And in the absence of a fully-charged CR7, it was a certain Dele Alli stealing the show.
Despite pre-match worries that the Englishman had waned somewhat this season, it took him just 27 minutes to shatter any suggestion that that was the case.
He arrived at the back post to slide home the opening goal after HarryWinks and Kieran Tripper combined before doubling Tottenham's lead with a deflected strike past Kiko Casilla.
Marry that to an all-round impressive showing and the excitement was very real.
It also prompted some rather interesting analysis from Rio Ferdinand who was reporting on the game as a pundit for BT Sport, alongside Glenn Hoddle and Frank Lampard.
He raised an excellent point about the secret to Alli's success as one of the game's finest young players.
The ex-Manchester United man expounded: "I'll tell you what I do like about him: he identifies the positions of his teammates and the addresses his own position off of that.
"For a young player to be so adept at that... I've seen many times - even today - where Kane is out wide and play's developing, he's the one in the box.
"For a young player to identify that is great, he's got a nous for positioning."
It was an opinion seconded by Gary Lineker, too, who cited the midfielder's 'intelligence' on the pitch before Hoddle acknowledged his ability to fill the number 10 role.
And he certainly did, in style, against Real - a sight all England fans will hope to see on an international stage.
There's still big things to come from Alli, that's for sure.
Do you think Dele Alli is the best young player in the Premier League? Have your say in the comments section below.