There was a buzz in the air at Celtic Park as Brendan Rodgers' men kicked off against PSG and their utterly terrifying front three of Kylian Mbappe, Neymar, and Edinson Cavani, but those hoping for another magical European night soon had their hopes dashed.
It took 20 minutes for the breakthrough to come, and when it did it was Neymar who was played through by a sublime Rabiot pass and finished with typical class.
PSG looked so crisp in possession and the lead was doubled 15 minutes later as Kylian Mbappe got his first Champions League goal for his new side with a confident finish, although that may be the least of Celtic's worrys after what followed.
A Celtic fan ran on to the pitch and appeared to attempt to kick Kylian Mbappe, and although he was unsuccessful, Celtic are likely to face UEFA action for the incident.
BBC Scotland's commentary provided some information as it was missed by the TV cameras:
The Celtic fans booed loudly after he tried to kick Mbappe, and those who saw the incident were quick to condemn it on Twitter.
— Mirror Football (@MirrorFootball) September 12, 2017
Someone's just run on the pitch and aimed a kick at Kylian Mbappe. (He missed)
— Rory Smith (@RorySmith) September 12, 2017
A Celtic fan runs on the pitch and tries to kick Mbappe. He misses, hopelessly. Clown. UEFA sure to act.
— Craig Hope (@CraigHope_DM) September 12, 2017
Celtic fan ran onto on the Parkhead pitch & aimed a fresh air kick at PSG's Mbappe. The Scottish champions have had 12 UEFA fines in 6 years
— Peter A Smith (@PeterAdamSmith) September 12, 2017
Ban that knob of a "fan" looking to kick Mbappe.
— Read Celtic (@ReadCeltic) September 12, 2017
— BBC Sportsound (@BBCSportsound) September 12, 2017
— NaeBull (@NaeBull) September 12, 2017
My God!What a performance from PSG. Barcelona at their most devastating best. Stunning.Celtic fan invades pitch/tries to kick Mbappe. Unreal
— Tom English (@BBCTomEnglish) September 12, 2017
What an absolute tit.
Celtic have been in a lot of trouble with UEFA over the actions of their fans in recent times, and then this plonker tries to kick an opposition player?
With so many packed in to Celtic park it is likely that footage will emerge soon, but even if it doesn't we can expect to hear a statement on this from the club, and probably from UEFA too, in the near future.