Kings Of Leon frontman Caleb Followill became so furious at his bandmates during their headlining slot at music festival T In The Park, he reportedly smashed his beloved guitar into pieces.
The family of rockers, including brothers Caleb, Nathan and Jared, and cousin Matthew, are notorious for their bust-ups - with the stars even breaking bones in their boozed-up scraps.
And their rock 'n' roll ways continued following a gig at the Scottish music event on Friday (10Jul09), when sound problems left singer Caleb infuriated with the rest of the band.
The rocker launched into a foul-mouthed tirade behind the scenes, and he became so angry he wrecked his favourite Gibson 325 guitar - the instrument the star writes all of the band's hits on, according to Britain's The Sun newspaper.
A source tells the publication, "His guitar is now ruined. The crowd were oblivious to the sound difficulties but the Kings want every show to be perfect.
"When they came off stage, tempers flared and they were effing and blinding at each other. It was really nasty before their tour manager stepped in."