Rangers fought back from a two-goal half-time deficit to draw 3-3 with Celtic as the cinch Premiership title race exploded at Ibrox.
Hoops attacker Daizen Maeda gave the visitors a stunning lead after just 21 seconds which rocked the home side.
The nervy Light Blues fell further behind in the 34th minute when midfielder Matt O’Riley coolly converted a penalty after a VAR intervention.
Rangers improved after the break and skipper James Tavernier scored from the spot in the 55th minute before striker Cyriel Dessers had the ball in the net two minutes later only for an earlier infringement to rule out a goal.
Substitute Abdallah Sima levelled in the 86th minute but a minute later Hoops substitute Adam Idah drove in for what looked like a dramatic winner only for Rangers replacement Rabbi Matondo to level in added time for a share of the spoils which left Celtic one point ahead at the top.
Rangers have a game in hand against Dundee on Wednesday but have still to go to Celtic Park after the split with more twists likely.
Rangers left-back Ridvan Yilmaz could not prove his fitness and Philippe Clement preferred utility player Dujon Sterling to Borna Barisic, while Tom Lawrence replaced Todd Cantwell.
Celtic captain Callum McGregor was only fit enough for the bench after recovering from an Achilles problem and he would have been as stunned as anyone when the Hoops took an instant lead.
Joe Hart’s long clearance went past hesitant Tavernier who tried to clear under pressure from Maeda but the ball rebounded off the Japan attacker and sped low past keeper Jack Butland.
The Ibrox support was taken aback as were the players who were all over the place in the ensuing minutes.
In the 24th minute a Mohamed Diomande corner was headed over by Connor Goldson before Butland made a great save from a Maeda drive and then Reo Hatate fired just wide from the edge of the box, bringing more jeers down from the stands.
Butland made an even better save from an O’Riley header on the half-hour mark and there was a VAR check for a possible Celtic penalty for a Goldson handball in the next attack.
When referee John Beaton checked his pitchside monitor at the behest of VAR Nick Walsh, he decided the ball had struck the centre-back’s elbow and pointed to the spot.
O’Riley dinked the ball down the middle and Butland dived the wrong way.
Just before the break Rangers forward Fabio Silva, who was having a frustrating afternoon, had two attempts from close range blocked but the boos rang out at the sound of Beaton’s half-time whistle.
Clement replaced winger Scott Wright with Sima for the start of the second half, where Silva was soon booked for diving inside the Celtic box after a challenge by Alistair Johnston.
Beaton, however, was again sent by the VAR check to the screen and again he pointed to the spot – it looked a soft award – cancelling out Silva’s yellow card and Tavernier blasted the ball high past Hart.
Then Dessers slammed in from close range following a goalmouth scramble but Beaton checked his monitor again and ruled Lawrence had fouled midfield counterpart Tomoki Iwata in the build-up.
The mood inside Ibrox had changed as Rangers went in search of an equaliser and it came with four minutes of normal time remaining when Sima picked up a clearance inside the Celtic box and fired high into the net via a deflection.
However, a moment later, Idah, on for Kyogo Furuhashi, took a pass from fellow substitute Paulo Bernardo and fired low past Butland.
But in the third of eight added minutes, Matondo turned inside in the Celtic box and curled the ball high past Hart and Ibrox bounced for the last few minutes, while the final whistle had players from both sides at loggerheads as passions boiled over.
Dream debut: Dixon shines with goal, assist on debut for Charlton U21s in 3-2 win over Watford
Reggae Boy Kaheim Dixon was on the scoresheet in his debut for Charlton Athletic U21s in a 3-2 win over Watford at Vicarage Road on Friday.
Charlton took the lead after just two minutes through a goal from Henry Rylah before Watford got their equalizer through Mamadou Doumbia a minute later.
The 19-year-old Dixon, who joined the League One club from Arnett Gardens in August, then capitalized from a defensive mistake by Watford to put his team up 2-1.
Charlton then went two goals clear thanks to Mile Leaburn, who was assisted by Dixon.
Doumbia got his second goal of the game to finish the scoring at 3-2.
Charlton U21s now have 19 points in seven games in the Professional Development League.
The win strengthens lead atop the table to six points.
They will next take on Brentford U21s on October 1.
Alcaraz beaten on Laver Cup debut with Zverev in doubles
Carlos Alcaraz suffered defeat on his Laver Cup debut, as he was beaten in straight sets alongside Alexander Zverev in doubles by Taylor Fritz and Ben Shelton.
Team Europe put up a strong fight but struggled to match Fritz and Shelton, who won 7-6 (7-5) 6-4 in one hour and 37 minutes.
Alcaraz and Zverev made a slow start to the match, losing their serve in the fourth game as the Americans went on a three-game winning streak, but they pulled it back to level the tie, only to lose the tie-break.
Team Europe looked to have found their groove in the second set but failed to convert four break points in the fourth game as Fritz and Shelton levelled the score at 2-2.
A three-game winning run at the end of the set, including one more break, was enough to get Team World over the line, pulling them back to 2-2 at the end of day one.
Francisco Cerundolo had originally given Team World the lead with a shock win over Casper Ruud before Stefanos Tsitsipas and Grigor Dimitrov's wins had put Team Europe 2-1 up.
Walter proud of 'courageous' Hull after comeback win
Tim Walter says he is proud of his "courageous" Hull City side after earning his first win in charge, beating Stoke City 3-1.
Narcis Pelach led the Potters out for the first time on Friday and saw his side take a 1-0 lead through Ben Wilmot into half-time.
However, Hull came out fighting in the second half to claim three points for the first time this season.
Kasey Palmer saw a penalty saved just after the hour mark but turned in the rebound before goals from Regan Slater and an own goal from Wilmot completed their late turnaround.
It is a win that propels the Tigers from 19th to 13th in the Championship, above Stoke, and Walter believes it has been a long time coming.
"It's hard to describe because I never had this feeling before. I've never not had a win in five games, so for me, it's a new situation," Walter told Sky Sports.
"But I also knew the whole time that we can win. Today we did it and that's the reason I'm really proud of my boys. They deserved to win.
"I'm happy because they always believed they can win and that's important.
"After conceding the goal, we were better. We were more courageous. We showed more bravery and that's the key to the result."
Pelach succeeded Steven Schumacher as Stoke's manager following his shock sacking earlier this week, having won two of the five matches under the Englishman at the start of the season.
Stoke managed 14 shots against Hull, but only two efforts on target, with both of those coming in the first 45 minutes.
Despite starting with a defeat, Pelach is looking for the positives after such a short time with the squad.
"It's a pity we couldn't win the game," Pelach told BBC Radio Stoke.
"We wanted to take the points, but I think the lads tried to put a new style of play in place.
"But in the second half, we lost control and ran out of energy. We should have pressed more, but we will try to explain this tomorrow and keep working on the defensive style.
"There is some things to work on mentally and we will do it. We will take the positives, and we will improve."
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