Celtic fans are known world over for the humour, their respect and the undying love they have for their team and players.
And even though their team crashed out of the Europa League to Bayer Leverkusen last night, nothing but fun was on their minds on the flight home.
The poor attendant on this return flight must have been wondering what the hell was going on as the Hoops fans broke out into the Callum McGregor song as he went about his daily duties.
To be fair to the boy, he took it as it was intended. All in good humour and the Celtic fans response to the video on twitter was just as great.