ARSENAL took a giant leap towards their first ever major European trophy by battering Real Madrid 3-0 on a barely-believable evening in North London.
Declan Rice scored two world-class free-kicks to give the Gunners the upper hand, before Mikel Merino grabbed a third.
Los Blancos were left utterly shellshocked with the likes of Kylian Mbappe, Vinicius Jr and Jude Bellingham outclassed at the Emirates.
But write off Real at your peril... the Spanish giants have won the European Cup a record 15 times.
Carlo Ancelotti has won the Champions League five times as a boss, while lifting two European Cups as a player.
If anyone can inspire a comeback, you'd back the Italian legend.
And Real certainly wouldn't be the first team to mount a jaw-dropping second-leg comeback.
SunSport takes a look at some of the best...
Ajax 2 Tottenham 3 - May 8, 2019
Having lost the first leg of their semi-final in North London 1-0, Spurs were by no means dead and buried.
However, future Premier League stars Matthijs de Ligt and Hakim Ziyech scored early in the second leg to give Ajax a surely unassailable 3-0 aggregate lead.
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But Lucas Moura would inspire one of the most remarkable turnarounds in history in the second half.
The Brazilian scored twice in four minutes shortly after half-time to give Tottenham a sniff of glory.
And, with the away goals rule still in place, Moura scored in the 96TH-MINUTE to complete his hat-trick and, more importantly, send Spurs into the final.
Unfortunately for Mauricio Pochettino's side, they would go on to lose 2-0 to Liverpool in the final.
Liverpool 4 Barcelona 0 - May 7, 2019
Spurs' win was arguably all the more remarkable given what had happened just 24 hours at Anfield. Who could forget "corner taken quickly..."
Liverpool had lost their semi-final first leg 3-0 in Barcelona after goals from former star Luis Suarez and Lionel Messi (two).
The Reds were without Mo Salah and Roberto Firmino for the clash, and started with a front three of Xherdan Shaqiri, Divock Origi and Sadio Mane.
The idea of scoring three times against Barca seemed impossible - even on a big European night in front of the Kop.
Origi got Liverpool off to a dream start within seven minutes to claw one goal back - but Barcelona had some huge chances to score in the first half, only to be denied by Alisson.
The game turned at half time, when Jurgen Klopp hauled off star left-back Andrew Robertson in favour of midfielder Georginio Wijnaldum.
The Dutch star scored twice within three minutes at the start of the second half to level the tie on aggregate.
With the away goals rule still active, Liverpool knew conceding would see them KO'd, with a tense atmosphere descending on Merseyside.
In one of the most iconic moments in Champions League history, Trent Alexander-Arnold caught Barcelona napping as he took a corner quickly, with Origi sweeping home to send the Kop wild and seal a 4-0 win.
Klopp's side would go on to lift their sixth Champions League crown as Salah and Origi scored in a 2-0 win at the Wanda Metropolitano.
PSG 1 Man Utd 3 - March 6, 2019
"Ole's at the wheel", cried Rio Ferdinand as the interim boss staged a remarkable Euro comeback.
Having replaced Jose Mourinho, Ole Gunnar Solskjaer's first defeat was the 2-0 loss at Old Trafford in the first leg of Manchester United's last 16 showdown.
In the 107 preceding occasions where a team had lost 2-0 or more in the first leg, none had ever come back to win.
But Romelu Lukaku set about changing history as he scored after just two minutes.
However, Juan Bernat levelled to give PSG a 3-1 aggregate lead just eight minutes later.
Lukaku grabbed another before the break, but United were unable to break the French giants down to grab what would be a winner, thanks to away goals.
That was until Marcus Rashford converted his 94th-minute penalty - his first competitive spot kick for the club - as a youthful United featuring Tahith Chong and Mason Greenwood made it to the quarters.
Roma 3 Barcelona 0 - April 10, 2018
"Roma have risen from their ruins" was the call from commentator Peter Drury after the Italian's side unlikely comeback win.
Having been battered 4-1 at the Nou Camp, Roma were expected to fall away with a whimper.
But Edin Dzeko netted early on to inspire a flicker of hope, before Daniele De Rossi and Kostas Manolas - who both scored own goals in the first leg - got on the scoresheet again to send the crowd wild.
Barcelona 6 PSG 1 - March 8, 2017
"La Remontada" - The Comeback.
PSG stormed to a 4-0 win at home and even "MSN" - Lionel Messi, Luis Suarez and Neymar - wouldn't be able to overturn such a deficit.
Or so we thought...
Suarez scored after just three minutes to set the tone, before a Layvin Kurzawa own goal made it 2-0 at the break.
Messi slotted home a spot-kick soon after half-time, but Edinson Cavani appeared to have struck the final nail in the coffin by pulling one back.
That goal made it 3-1 in the night, but 3-5 on aggregate, with Barcelona needing THREE due to away goals.
As the clock ticked over to 87 minutes, an increasingly-desperate Barcelona were still hunting a surely-impossible treble.
Neymar curled home a free kick to give the faintest of hopes as the Nou Camp erupted.
But then, in the 91st minute, they were awarded a penalty - tucked away by Neymar.
Unable to keep the Brazilian out of the game, PSG were stunned in the final 20 seconds of added time as Neymar floated a ball into the box and a stretching Sergi Roberto poked the ball home in one of the wildest finales to a football match in history.
Deportivo La Coruna 4 AC Milan 0 - April 7, 2004
Delving a little further into the archives for this one, fallen giants Deportivo La Coruna shocked peak Milan in the 2004 quarter-finals.
Milan won the first leg convincingly, as Kaka (two), Andriy Shevchenko and Andrea Pirlo all scored in an eight-minute span, after the Spaniards had taken a shock lead.
The LaLiga side - now in the third tier - needed something special in the return leg and that's exactly what they got.
Walter Pandiani scored within five minutes to give them hope, before Valeron and Luque had wiped out the deficit before the break.
Despite already leading on away goals, they then grabbed another with 15 minutes to play to kill the match off completely and reach the semis - where they lost 1-0 to the eventual champions, Jose Mourinho's Porto.
