A perfect penalty from debutant Kelechi Iheanacho secured three points for Celtic at the end of a pulsating Scottish Premiership encounter with Kilmarnock.
The VAR-awarded spot-kick had Celtic fans in the Chadwick Stand, half of whom had delayed their arrival until the 12th minute in protest at the club's board, celebrating wildly as their side returned to the top of the table.
In contrast, the home support were crestfallen after being on course for at least a point.
David Watson had powerfully nodded in to cancel out a fine diving header from Daizen Maeda, the off-form Japan star stooping to direct in Marcelo Saracchi's fine cross shortly after half-time for his first league goal this season.
But there was to be a dramatic end as referee John Beaton went to the monitor after James Forrest's shot struck Lewis Mayo arm on its way, with the Kilmarnock defender judged to have had his arm in an unnatural position.
Around half the visiting support delayed their entry at Rugby Park in protest against what they view as a lack of ambition and spending by Celtic's hierarchy.
Chants of 'sack the board' after the final whistle were somewhat muted, given the joy that greeted Iheanacho's late strike.
Until the first goal went in, a fairly drab, gloomy affair ensued, illuminated every now and again by the skill, speed and flair of Celtic wing debutant, Sebastian Tounekti, who already looks like the best bit of business in a transfer window that otherwise frustrated manager Brendan Rodgers and the support alike.
Celtic look like they needed something to spark them into life this season, and it may well just have been provided by Iheanacho's dramatic introduction into Scotland's top flight, the Nigeria international having joined as a free agent after the closure of the summer transfer window.
Though disappointed, Kilmarnock will take great heart from the way they contained the visitors for much of the match and the threat they posed towards the end of the game.
Celtic lead Hearts on goal difference after five games, with Hibernian and St Mirren both seven points off the top two. Stuart Kettlewell's Killie, eighth, remain on four points.
