Footage has emerged of Celtic captain Scott Brown intercepting a note passed onto the pitch by Aberdeen boss Derek McInnes during the Dons' trip to Parkhead on Saturday.
The Hoops managed to secure a crucial 1-0 victory, thanks in no small part to Scott Sinclair's cheeky second-half back-heel.
But one of the most eye-catching moments was so-called 'note-gate', with Brown eventually passing the piece of paper to Brendan Rodgers.
Aberdeen substitute Max Lowe came onto the pitch in the second period, with his side 1-0 down, and quickly passed a slip of scrap paper with instructions to his captain, Graeme Shinnie.
But as Shinnie got to grips with what was written, Celtic midfielder Tom Rogic quickly whipped it off him - before handing it to Brown.
Eventually, Rodgers took the paper and balled it up before taking the chance to read it.
Aberdeen manager Derreck McInnes then proceeded to call Brown a 'teacher's pet' after he stole the note, which then led to an Instagram response from the Celtic midfielder.
He posted the following on his Instagram story. Nice use of crying emojis, Scott.
What do you think of the funny exchange? And why don't managers just shout instructions to players, or call them over to the touchline when the ball goes out of play?
What do you think? Let us know.