Celtic thrashed Dunfermline 8-1, with Polish striker Maciej Zurawski netting four goals, to re-open a 13-point gap at the top of the Scottish Premier League.
Second from bottom Dunfermline were level at 1-1 after 14 minutes before Celtic raced to their biggest win of the season and of Gordon Strachan's managerial career.
"Dunfermline were unlucky to get us on a day like this," Strachan told Setanta TV after the second biggest away victory in Celtic's history.
"I have never been through this in my life before," said Dunfermline manager Jim Leishman.
"It is really hurting. My heart is pounding and my stomach's churning. It is hard to take." The two sides meet again in the League Cup final on March 19 at Hampden.
Celtic have 67 points from 27 games with Hearts second courtesy of their 3-0 home win over Motherwell on Saturday.
Champions Rangers ended their Hibernian hoodoo with a 2-0 home victory on Saturday, their first in four league and cup tussles this season, to go third with 46 points.
Bulgarian Stilian Petrov grabbed the third minute opener for Celtic who were denied a penalty soon afterwards when Petrov was brought down. A minute later Dunfermline levelled.
Craig Wilson whipped over a corner and the ball found its way to Andy Campbell who hooked it back across for Andy Tod to head high into the net.
Zurawski was blocked by keeper Bryn Halliwell a few metres from goal but the ball fell for Welshman John Hartson to tuck it home in 24 minutes for 2-1.
Hartson repaid the favour with a neat pass into Zurawski's path on the left of the box eight minutes later. Zurawski then sprang the offside trap to latch on to a long ball out of defence and score.
The Pole grabbed his hat trick in the 56th minute with a low shot from 10 metres out. Shaun Maloney sent a bicycle kick volley into the top left hand corner for 6-1 before captain Neil Lennon swept a 20-metre shot in for the seventh.
Zurawski rounded off a devastating display with his fourth.
