Looks like Celtic have played knifey spoony before, and they're pretty good at it!
While some fans like to sing songs about each other, some decide to take things a little bit too far, or in the this case, way too far!
Now Turkish football fans don't exactly have the best reputation, so we have no idea what this lot are thinking about when they got stuck in with some Celtic fans by posting these pictures on Twitter.
Fenerbache fans send a welcome message to their Europa League opponents... pic.twitter.com/fOIoLpvX1T— Celtic Wiki (@TheCelticWiki) August 29, 2015
However, Celtic fans were quick to get back at their Turkish counterparts by posting some brilliantly hilarious responses that made them look well threatening with the hashtag 'Thatsnotaknife'.
— Liam Watson (@liam_Watson72) August 29, 2015
What we do know is we have got a lot of time for the Celtic fans who took the time for grab their Dyson and some Mr Sheen and show Fenerbahce fans that they need to calm it down.
One thing for sure is, we're looking forward to Celtic vs Fenerbahce when they face off against each other in the Europa League – let's just hope all the fans enjoy the football.