Usually when Scott McDonald scores, Celtic record a victory but not on this occasion as third-placed Aberdeen ran riot against the reigning champions, winning 4-2.
Aberdeen hit the lead in the 24th minute through Gar McDonald before Celtic's Scott Brown got the match back on level terms within a minute.
Stuart Duff gave the lead back to the Dons with a .lovely half-volley before Socceroo striker Scott McDonald restored sanity with a header just after half-time.
Two goals in four minutes to Aberdeen defender Alexander Diamond sealed a famous victory for the Dons.