The history of tactical instructions from the bench is long and varied, from managers screaming for 90 minutes to those who sensibly choose to merely sit and glare at their players.
On Wednesday night a new situation was seen as Daniel Sturridge had to chase his team-mates with a note handed to him by Jurgen Klopp.
Sportsmail has put together a tongue-in-cheek guide to managers handing over notes and instructions in general.
Daniel Sturridge was handed a note by the Liverpool bench on Wednesday in the EFL Cup
What happened with Daniel Sturridge on Wednesday night?
Sturridge was handed a note with instructions by Klopp as Liverpool chased a draw against Southampton in their EFL Cup semi-final. That led to a farcical situation whereby the forward was attempting to play and instruct at the same time.
Publically, Jurgen Klopp has called it his own fault, an attempt to switch to a 3-5-2 formation at a point when he expected a substitution to take longer than it did.
But what few know is that it was actually Klopp’s greatest innovation yet - the inverted false manager, or as it is known in Germany, eine Falscheinvertiertrainer. It’s meant to allow a player to argue with the fourth official at all times while simultaneously heading and kicking every ball.
Expect other managers to follow suit. Word is that Chelsea boss Antonio Conte has already come up with his own version, the backwards data analyst. Victor Moses has been earmarked for the role.
The game kicked off before Sturridge could relay the message, leaving him running about
Sturridge attempts to interpret the note handed to him by Liverpool manager Jurgen Klopp
How can opposition players stop managers being effective with their instructions?
Like all important revolutions in football, this one was pioneered by Ross Wallace. The Sheffield Wednesday midfielder spotted Huddersfield’s Elias Kachunga reading a note from manager David Wagner and grabbed it off him to have a look.
Unfortunately for Wallace, he did not realise that each manager has their own unique script that allows them to communicate secretly with their players.
Huddersfield Town's Elias Kachunga reads a note handed to him by manager David Wagner
The note is stolen from the Huddersfield forward by Sheffield Wednesday's Ross Wallace
Wallace attempts to read the note handed to Kachunga as he looks for some insight
Few fans know that at least 20 per cent of all training sessions at every football club are dedicated to learning increasingly complex character sets