Atletico Madrid fans must wake up in hot sweats thinking about Cristiano Ronaldo.
As well as being the greatest goal-scorer to ever play for their bitter rivals Real Madrid, you'd be forgiven for thinking that Ronaldo had a personal vendetta against Los Rojiblancos.
Besides, Diego Simeone hasn't lost a single Champions League knockout tie in charge of Atletico... aside from when he's played against a team with Ronaldo in their squad.
The Portuguese helped dish heartbreak on Atletico during the 2014 and 2016 Champions League finals, while also dumping them out of the competition in 2015, 2017 and 2019.
In fact, Ronaldo boasts a stunning record of 25 goals, nine assists, 17 victories and just nine defeats from his 35 clashes with Atletico throughout his career.
Juventus vs Atletico Madrid
But let's backtrack to those Champions League exits again because some of those ties with Atletico have marked Ronaldo performances that will long be considered amongst his greatest.
And while his hat-trick in the 2017 semi-final would be a solid shout for the best of the best, we're inclined to think his most recent showing and his only example with Juventus is the finest of all.
There are few things better in sport than a comeback and Juventus had an unenviable challenge on their hands after losing the first leg of their round of 16 tie 2-0 at the Wanda Metropolitano.
Ronaldo hits back in Turin
But when you have a certain Ronaldo in your squad, there's also a chance to turn things around and the 34-year-old put on an absolute masterclass in Turin to score a hat-trick in the return leg.
With no response from Atletico, the Old Lady secured a 3-0 win to progress 3-2 on aggregate and Ronaldo mocked Simeone by replicating his very own 'cojones' celebration from the first game.
In other words, the level of badassery was through the roof and that gave Twitter user @b3naldo7 the idea of reminding supporters about it while there's no live football to enjoy.
Racking up 31,500 retweets and 62,800 'likes', it would be fair to say the video has been a success and you can reminisce on Ronaldo's brilliance by watching it down below:
Forget ice, Atletico need a glacier for that burn.
While you never get the impression that Ronaldo isn't up for a game, you can just tell when he's especially pumped up and all the clamour after the first leg clearly gave him extra motivation.
With every overconfident comment from Atletico fans, you just sensed that it was poking the Ronaldo hornet's nest more and more until he was fired up to hit back in the style.
And boy did he deliver. Ronaldo had the sporting world bowing at his feet after hammering home two headers and a penalty to eliminate Atletico just when they thought they'd ended the curse.
Perhaps the only downside to the situation is that Ronaldo and Juventus were also given the boot just one round later by a plucky Ajax side, although by no fault from their Portuguese star.
But regardless of what happened next, we'll be talking about that Ronaldo performance for years to come or in the case of Atletico fans, crying about it.