Martin O'Neill spent his 74th birthday intervening in a mass confrontation at Ibrox after Celtic rescued a point from two goals behind against Rangers on Sunday.
The veteran Celtic manager charged towards the centre circle as tempers boiled over following the 2-2 draw, physically ushering Tomas Cvancara, Dane Murray and match-saver Reo Hatate away from the melee.
Celtic legend Chris Sutton, providing commentary for Sky Sports, quipped: "He shouldn't be doing that at his age!"
The dramatic scenes capped an extraordinary afternoon in Glasgow where Danny Röhl's Rangers had appeared destined for victory before Celtic's remarkable second-half fightback.
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Chermiti announced himself in stunning fashion after just eight minutes, connecting with Andreas Skov Olsen's floated delivery to execute a perfectly timed overhead kick that beat Viljami Sinisalo.
The Portuguese striker was not finished there, doubling Rangers' advantage in the 26th minute after pouncing on a wayward clearance from Murray.
He muscled Julian Araujo off the ball before slotting a composed low finish into the net.
😳 Tempers flare as the full-time whistle is blown at Ibrox.
— Sky Sports Scotland (@ScotlandSky) March 1, 2026
It finishes 2-2 in a derby of two halves between Rangers and Celtic. Your thoughts on the game? 💭 pic.twitter.com/AzSVHliHm5
Celtic's defence looked disorganised throughout the opening period, with O'Neill's side appearing to suffer from the physical toll of their midweek European commitments.
At the interval, Rangers appeared in complete control of the contest.
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Youssef Chermiti had fired Rangers 2-0 up against Celtic | PAThe visitors transformed after the break, finding their rhythm through a flowing passing move in the 56th minute that allowed Benjamin Nygren to tee up Tierney for a powerful header past Jack Butland.
Celtic pressed relentlessly for a leveller as Rangers retreated deeper into their own half.
The breakthrough arrived in chaotic circumstances during stoppage time. VAR awarded a penalty in the 89th minute after Dujon Sterling was adjudged to have handled inside the area.
Hatate's spot-kick was repelled by Butland, who then denied the rebound, but the Japanese midfielder bundled home at the third attempt to spark pandemonium.
Celtic came from two goals down in the Old Firm derby on Sunday, with the Hoops boosting their chances of Scottish Premiership title glory in the process | GETTYThe final whistle sparked ugly confrontations across the pitch. Mikey Moore shoved Julian Araujo before angrily jabbing his finger at the Mexican defender, whilst Nicolas Raskin and Liam Scales became embroiled in their own altercation.
Tuur Rommens and Cvancara also squared up in full view of the television cameras before O'Neill's intervention.
The shared spoils leave both Glasgow clubs trailing in the title race. Hearts remain six points clear at the summit of the Scottish Premiership, with Rangers occupying second place.
Celtic sit a further two points adrift in third, though O'Neill's side have a game in hand over their rivals.