SPL Review:Aberdeen came from behind three times against Celtic to draw 4-4 at Pittodrie to put a dent in the Hoops' Clydesdale Bank Premier League title aspirations.
The first half ended level after goals from Diomansy Kamara and Marc-Antoine Fortune had been cancelled out by Michael Paton and Darren Mackie.
The Parkhead side went two clear with strikes from Robbie Keane and Aiden McGeady but Dons striker Steve MacLean reduced the deficit from the spot before grabbing a dramatic late equaliser as Celtic defender Darren O'Dea was sent off in the final stages.
David Goodwillie came off the bench to snatch a 2-1 victory for Dundee United against St Mirren as they kept the pressure on Hibernian for third place.
Saints must have thought they had the game won when Michael Higdon grabbed the opener on a day when both sides passed up decent chances.
But United netted twice in the last seven minutes through Danny Swanson and Goodwillie to claim a dramatic last-gasp victory in Paisley.
Hearts midfielder Ian Black put a dressing room bust-up with team-mate Christian Nade behind him to lead the Tynecastle outfit back into the top six with a 3-2 victory over Falkirk.
The playmaker, who rowed with the Frenchman following Wednesday's defeat at Celtic, scored a superb third goal and produced an all-action performance in the middle of the park.
Hearts took the lead in the fifth minute when Lee Wallace's cross caught out Robert Olejnik at the near post and sailed into the net.
David Kucharski scored a first half-injury time own goal to bring the visitors level, but Suso Santana and Black struck after the break.
Falkirk substitute Pedro Moutinho notched a consolation goal with seven minutes left but Steven Pressley still suffered a loss in his first game as manager of the Bairns.
John Ruddy made a succession of second-half saves to maintain Motherwell's unbeaten SPL record under Craig Brown as they drew 0-0 with Hamilton.
The Motherwell goalkeeper denied Simon Mensing three times in five minutes as Hamilton pushed forward after an even first half.
But the home side could not maintain their pressure and John Sutton missed a good chance to take the points across Lanarkshire.
Kevin Kyle was St Johnstone's nemesis once again as resurgent Kilmarnock twice came from behind to snatch a 3-2 win in another Rugby Park thriller.
Killie's fine recent run looked like coming to an end when Peter MacDonald and Graham Gartland put Saints 1-0 and 2-1 ahead in Saturday's clash.
But equalisers from Chris Maguire and Garry Hay - the latter's first goal since December 2008 - set the stage for Kyle to bag his fourth against Derek McInnes' men this season.
Scottish Premier League
Aberdeen 4 Celtic 4
Hamilton 0 Motherwell 0
Hearts 3 Falkirk 2
Kilmarnock 3 St Johnstone 2
St Mirren 1 Dundee Utd 2
FA Cup Fifth Round
Chelsea 4 Cardiff 1
Derby 1 Birmingham 2
Man City 0 Stoke 0 (L)
Reading 2 West Brom 2
Southampton 1 Portsmouth 4