Celtic got a taste of their own medicine in Germany as they came crashing back down to earth with a 7-1 Champions League defeat against Borussia Dortmund.
Brendan Rodgers' side had won their previous 17 matches and scored 33 goals this season before arriving at the Signal Iduna Park in confident mood, fresh from a 6-0 win over St Johnstone on Saturday and a 5-1 victory over Slovan Bratislava in their Champions League opener.
But they found the step up in class too much to handle as they were overrun by last year's runners-up, not helped by the absence of centre-back Cameron Carter-Vickers and some slack passing throughout their team.
Celtic were briefly level when Daizen Maeda cancelled out Emre Can's early penalty but Karim Adeyemi bagged a first-half hat-trick and Serhou Guirassy also scored from the spot before the interval.
Guirassy and Felix Nmecha piled on the misery after the interval as Rodgers found himself presiding over another Champions League thrashing.
Celtic's heaviest European defeat remains a 7-0 loss in Barcelona during Rodgers' first spell in charge and he also suffered a 7-1 defeat against Paris St Germain and a 6-0 loss to Atletico Madrid.
We give each starter involved a mark out of ten for their performance in Germany:
5. Greg Taylor
A torrid evening for the left-back, part of a backline that was brutally exposed. Came off for Alex Valle at the break. 2 | AP
6. Callum McGregor
The captain was just completely off it, right from the word go. A dominance force domestically but reduced to a clawless cat in the middle of the park by Dortmund's maestros. 2 | Getty Images
7. Arne Engels
Put in a nice ball for Maeda's goal but conceded a penalty with an albeit soft tackle on Adeyemi. Unable to have any meaningful influence on the match. 2 | AP
8. Paulo Bernardo
Any one of the midfield three could have been withdrawn at the break, given how badly they were over-run. The Portuguese was hooked for Reo Hatate during the interval after chasing shadows for 45 minutes. 2 | Getty Images