It would be the most amazing finish to the season - Celtic and Rangers locked in a one-off battle at the national stadium.
It will happen if the Old Firm giants end up level on points, goal difference and goals scored when final whistles are blown at Ibrox and Rugby Park tomorrow.
Rangers, who take on Dunfermline at Ibrox, are top solely by the
virtue of having scored one more goal than their rivals, who travel to Kilmarnock.
Such a tantalising scenario has never happened before - but there has been a Hampden Park play-off between the Glasgow rivals.
That was back in the 1904-05 season when both clubs ended the season level on points. Goal difference had not been devised then and goal average, its predecessor, was not in operation either.
So a play-off was scheduled to take place at Hampden and a crowd of 30,000 saw Celtic win 2-1.
That was a big disappointment for Rangers, who would have taken the title on goal difference had it existed.
And it was also the second time they had failed to win a title play-off as they had shared a 2-2 draw with Dumbarton in 1890-91.
Both sides had finished level on points and 10,000 turned up at First Cathkin to see the match.
But the sport was more gentlemanly in those days - and the two clubs simply agreed to share the spoils after the draw and declared themselves joint champions.
This season's play-off would go to extra-time and penalties if it ended all square on Tuesday, June 3rd.
Previous photo finishes
1997-98
Champions: Celtic
Wim Jansen's side were almost there already and went into the final game, at home to St Johnstone, two points clear of Rangers.
A 2-0 win wrapped things up on a day when a draw would not have been enough as Rangers won at Dundee United and had a better goal difference tally.
1990-91
Champions: Rangers
Rangers boss Alex McLeish will remember this one but none-too-fondly as he was a member of the Aberdeen side that fell at the final hurdle.
Alex Smith's side needed only a
draw from the final game to pip Rangers, with the sides level on points and goal difference - and playing each other.
Aberdeen had scored more goals but that became irrelevant when they lost 2-0 at Ibrox with Mark Hateley getting both.
1985-86
Champions: Celtic
Hearts managed a sensational "Devon Loch-style finish" to throw away a title that had seemed a formality before kick-off. Hearts were two points ahead of Celtic and boasted a superior goal difference as well.
It was two points for a win in those days, but the Jambos crashed 2-0 at Dundee with Albert Kidd netting both late goals.
Hearts knew that would be their doom as Celtic had been 4-0 up at St Mirren at half-time and their eventual 5-0 success saw them take the title by three goals.
1982-83
Champions: Dundee United
Three teams were in contention going into the last day but a 2-1 win for United at rivals Dundee meant their one-point advantage remained intact.
Celtic won 4-2 at Rangers and Aberdeen, who had just beaten Real Madrid to lift the European Cup Winners' Cup, won 5-0 at Hibernian but it was the Arabs who were celebrating.
1964-65
Champions: Kilmarnock
With two games remaining four clubs had a chance of the title - and none of them were
Celtic or Rangers.
Dunfermline and Hibernian had fallen by the wayside by the final day leaving Hearts and Kilmarnock to fight it out.
And, as it happened, the two sides were playing each other at Tynecastle, with Hearts kicking off two points ahead and with a slightly superior goal average. Killie knew a 2-0 win would be enough, however, and that was exactly what they achieved to pip the home side by just 0.04 of a goal.
Heartbroken Hearts moved to have goal average replaced by goal difference, but that ended up backfiring badly - goal average would have given them the title in 1986.