Joey Barton has only been a Rangers player for the last month or so, but that didn't stop him reacting to Celtic's shock Champions League qualifying defeat at the hands of Lincoln Red Imps from Gibraltar.
It was a truly dismal performance from Brendan Rodgers' side, who must now overturn the deficit during the second leg at Celtic Park next week.
As you can imagine, Barton, who signed for Rangers from Premier League new boys Burnley, just couldn't contain himself on social media.
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Barton will be hoping to play a key role for Rangers in their first season back in Scotland's elite division following a difficult couple of years.
His reaction to Celtic's humbling in Europe wasn't exactly surprising, however, as he produced a number of laughing emojis.
Fans of both Celtic and Rangers reacted to his tweet - and we've picked out the best responses for your pleasure...
Celtic boss 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!