Something curious happened during the thrilling 3-3 draw between Hungary and Portugal this evening.
Portugal boss Fernando Santos handed a note to Eliseu, who then passed it on to Cristiano Ronaldo.
Unsurprisingly, this set tongues wagging - particularly on social media - with people keen to guess what might have been written on the aforementioned piece of paper.
SIGN UP NOW
Want to become a GMS writer? Sign up now and submit a 250-word test article: http://gms.to/haveyoursay4
We’ll probably never know and the chances are it’s not particularly interesting, but people on Twitter were at their most mischievous and funniest while discussing what it might have said.
Lionel Messi’s name cropped up a few times - shock - and you can see the best tweets by scrolling a little further down this page.
Video: Ronaldo handed note
What did the note say?
Ronaldo on top form tonight
Ronaldo was in scintillating form for Portugal against the Hungarians, netting a brace, including a goal of the tournament contender.
The 31-year-old’s double ensured Portugal reached the knockout stages; they will now face Euro 2016 dark horses Croatia in Lens on Saturday.
By advancing to the knockout rounds, Ronaldo also has an opportunity to land his hands on the coveted top scorer award.
He will still feel frustrated after missing so many chances - including a penalty - in Portugal’s first two Euro 2016 matches against Iceland and Romania, but he looked keen to make amends this evening.
Ronaldo: The match was a 'little insane'
Ronaldo, who was filmed throwing a reporter’s microphone into a lake during Portugal’s pre-match walk today, refused to take questions in the post-match press conference but issued a statement about his feelings after the match.
"We played a good match, it was a little insane - Hungary scored and then Portugal scored - and it was very hot,” the Real Madrid forward was quoted as saying by Sky Sports.
"Personally I was happy as the team was in dire straits - three times we had to chase down the score and three times we came back.
"It's for me a privilege to be named man of the match but our priority was to win the match and we failed to do that. The bottom line is that we wanted to qualify."
On the prospect of facing Croatia, Ronaldo added: "Croatia are a good team but the odds are 50-50 and whoever plays the best match will go through. We saw highlights of the Spain match and they are a tough team with very good players.
"Not every team manages to beat Spain so we respect them. We know their strengths but we will look them in the eyes when we face them."
What was written on Cristiano Ronaldo’s note? Have your say by leaving a comment below.