Real Madrid superstar Cristiano Ronaldo did something that everyone does at home - come on, admit it - but few people would ever dream of doing inside the stadium: he sang the Champions League anthem.
As the camera panned across the Real Madrid line-up prior to their crucial Champions League quarter-final second leg against Atletico Madrid, the three-time Ballon d'Or winner was seen mouthing "The Champions!" (Scroll down to see the video)
This caused much amusement on Twitter. Ronaldo *was* singing the Champions League song like a national anthem - and the best thing is he didn't even look embarrassed.
Everyone knows the Champions League anthem and, of course, it is an emotive piece of music with the power to make the hairs on the back of your neck stand on end - particularly on those huge European nights.
Ronaldo clearly has great affection for Europe's premier club competition and is desperate to help Real Madrid become the first team to successfully defend the trophy in its current format.
Ronaldo plays key role in Real Madrid win
It was the Portuguese superstar who provided the all-important assist for Javier Hernandez's winning goal - Thierry Henry even went as far as to say it was Ronaldo's goal - as Los Blancos booked their place in the Champions League semi-final draw, which takes place on Friday.
Ronaldo would have been desperate to score that goal himself, but kept his composure and provided the perfect pass for Hernandez to tap home.
No player has scored more Champions League goals in the history of the competition than Ronaldo, who has netted a magnificent 75 goals in 111 appearances.
Messi, though, has the same number of goals, albeit from fewer matches played. The four-time Ballon d'Or winner reached 75 goals in just 94 games.
Ronaldo and Messi could meet in semi-finals
There's every chance that Messi and Ronaldo will end up going head-to-head in the Champions League semi-finals, depending on the outcome of Friday's draw.
The last time that happened was during the 2010-11 campaign, when a Messi-inspired Barcelona won the first leg 2-0 at the Bernabeu before a 1-1 draw at the Camp Nou in the second took them through to the final.
Real Madrid will be out to inflict revenge for that heartbreaking defeat should they be drawn to face each other in the semi-finals - and it's safe to say everyone will be hoping Ronaldo gives us another rendition of the Champions League anthem prior to kick-off.
Will Real Madrid win this season's Champions League title? If not, which team will? Have your say in the comments below!