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:
9. Daizen Maeda
Timed his run well to score the opening goal and was one of the few Celtic players to do anything positive on the night. 4 | AFP via Getty Images
10. Kyogo Furuhashi
Cut an extremely isolated figure in attack and was given no meaningful service to feed upon. Could only watch on helplessly as his team-mates behind him were put to the sword by Dortmund. Replaced by Idah. 3 | AP
11. Nicolas Kuhn
Has started this season well, but this was a poor performance. Offered little defensive resistance and was wasteful when the ball was at his feet. Replaced by Yang. 2 | AFP via Getty Images
12. Substitutes
No pass marks for any of the five that came on. Reo Hatate could not shore up midfield, Adam Idah missed a good chance, Alex Valle came in at left-back, while Yang Hjun-jun and Anthony Ralston also appeared. | Substitutes