It was a night to forget for Brendan Rodgers as he watched his Celtic side succumb to Lincoln Red Imps in the Champions League second qualifying round.
The Gibraltan outfit are only part-timers but managed to secure a shock 1-0 win over the Scottish champions.
The game, of course, represented Rodgers' first fixture in charge of the club after he replaced Ronny Deila at the helm.
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But the European contest was one to forget for Rodgers and co. as Lee Casciaro's solitary goal sensationally separated the two sides.
There's every chance that Celtic will still secure a place in the next round - they play host to Lincoln Red Imps in the return leg next week - but it was well and truly a painful evening for all involved.
Liverpool fans react
As you can imagine, then, there was a great deal of response to Celtic's defeat on social media and one set of supporters in particular were fairly prominent on Twitter.
Indeed, Liverpool fans, who not so long ago chanted Rodgers' name, couldn't help but troll him on social media.
The manager's reign at Anfield ended abruptly after a disappointing start to the 2015/16 campaign and it's clear for all to see that the Liverpool faithful are now very happy that they have Jurgen Klopp - and not Rodgers - as their manager.
Here are the best tweets:
Rodgers, meanwhile, insisted that his side weren't embarrassed by the part-timers.
He said, per BBC Sport: "A game that we dominated and had enough chances to score, but sometimes it can happen in games like that, one ball up the pitch and they’re in.
"We’ve given ourselves a bit of work to do. I saw enough from the game, we created enough to go through. Of course you never want to lose the game.
"You let the local team have their night, we press on, another week’s training and be better for it.
"There’s no embarrassment. We never took our chances and they took theirs. The second leg will be different.
"There's no panic. We’ve got enough quality here to get through to the next round. It’s a two-legged affair, our objective is to get through.
"I think the players gave everything that they had. The message (to the fans) is to stay calm. I always felt this qualification phase would be based on the second legs at home and we’ll need their support."
What did you make of Celtic's shocking display? Have your say below!