Aberdeen were 1-0 down with 20 minutes to go against Celtic on Saturday afternoon when manager Derek McInnes sent on midfielder Max Lowe to replace Steve May. Lowe carried with him handwritten instructions from McInnes for his captain Graeme Shinnie.
Accounts of what happened next vary but somehow the note ended up in the hands of Scott Brown. That was either by teammate Tom Rogic taking it from Shinnie or the Australian picking it up from the Celtic Park turf after it had been thrown away.
Brown then handed the note to Celtic manager Brendan Rodgers.
"I could say something but I won’t," McInnes told the Daily Record after the game.
But what I will say is he ran straight to his manager, didn’t he? Like all good wee boys.
To be fair what was written on the paper was not anything which was complicated.
Rodgers said that he did not actually read the instructions.
"It was a bit of respect, really. There was obviously a bit of banter there.
"I maybe couldn’t have read his writing anyway! It was good fun."
Celtic won the game 1-0 thanks to Scott Sinclair's 63rd minute goal.
Photo by Stephen McCarthy/Sportsfile