The British rockers - made up of Chris Martin, Jonny Buckland, Guy Berryman and Will Champion - got so riled up on one occasion that Chris and Guy challenged one another to a fight.
Matt McGinn - the band`s roadie - explained: "Chris temporarily lost touch with his niceness and called his friend a **** in so venomous a fashion that our loveable Caledonian felt moved to respond thus, `I`m going to f***ing hit you in a minute`. `Well go on then!` came the retort, sounding more like an order than an invite.
"B****y hell, here we go, I thought. Guy has confessed to me since that at this point he became so furious that anything could have happened, and he really wasn`t much more than a kilt`s width from braining Chris with his vintage Fender."
Matt admitted while many people consider Chris to be the band`s frontman, Coldplay is actually more of a democratic unit.
In his new book `Roadie: My Life on the Road with Coldplay`, he said: "Coldplay function as a unit. For a start, when push comes to shove they aren`t really at all scared of one another, which cuts out the tiptoeing that a lot of groups might waste time doing.
"Plus, despite the generally held public notion that Chris is the boss, I hope you`re getting a picture of a gang of lads rather than one dude and his hired help.