It's something often spoke about that players can barely hear themselves think while on the pitch during an Old Firm game.
The noise from supporters of both clubs makes it a cauldron and you have to be very close to your team-mates to hear anything they say.
But the SPFL's highlight package from Saturday's 1-0 win for Rangers over Celtic has given a unique insight into the game.
With the game still being played behind closed doors, it gives a unique insight into what is said in these games as the shouts of players and management staff can be heard.
You can hear Allan McGregor attempt to persuade the referee that he never made a wondersave from Leigh Griffiths' first half effort, and you can also hear him give his defenders an earful.
That's not all you can get an insight too as you can hear Kristoffer Ajer's claim that he was covering Nir Bitton and it was only a 'yellow card, yellow card', instead of the red that Bobby Madden showed.
And while there was no fans in the stadium, the shrieks of delight as Callum McGregor diverted Joe Aribo's header into the back of the net made it sound like there was 50k people inside Ibrox.
Watch the full highlights in our player above and hear it all for yourself.
