Our look at five unheralded victories over our greatest rivals continues with this emphatic victory from 1991.
This game has always been overshadowed by the game which took place the week before, the infamous 'St Patrick's Day Massacre', Celtic defeating Rangers 2-0 in a game which had four red cards, and all manner of mayhem.
So when the teams met again a week later, the hope from the authorities was that the game wouldn't be the POWDERKEG which took place seven days earlier. And to be fair, it wasn't - there was only one red card! And an even more emphatic Celtic victory.
The game burst into life after only seven minutes, as Celtic took the lead through an entirely unexpected source. Rangers goalie Chris Woods misjudged a cross ball and the ball ended up at the feet of Celtic full-back Anton Rogan, who miskicked the ball into the net for an extremely rare goal.
Rangers - who were thirteen points ahead of us in the league at this stage - had the better of the rest of the first half but were unable to put the ball into the net, with John Spencer missing two great chances.
Celtic increased our lead in the fifty-third minute, a long ball by Rogan ended up with Tommy Coyne clean through on goal, however he was forced wide by Woods and crossed the ball to Joe Miller whose deflected strike ended up in the net, 2-0, wild celebrations, and game over.
Rangers were inevitably reduced to ten men when Scott Nisbet was shown a straight red for a dreadful challenge on Paul McStay who could easily have ended up with a broken leg.
The third goal arrived five minutes from time, an unmarked Tommy Coyne heading home a McStay cross, as Celtic finished the game on a high.
This victory and the one the previous week were sadly the last hurrahs for Billy McNeill as Celtic manager, as he lost his job at the end of the season after losing in the Scottish Cup semi-final to Motherwell and finishing in third place in the league. He would leave the fans with good memories though, and this game would undoubtedly be one of those.
Celtic 3 (Rogan 7, Miller 53, Coyne 85) Rangers 0