Obvs, these two get up to plenty of onstage hijinks, including water fights and even busting out a fire extinguisher. It's all in good fun.
This go around though, Liam and Louis seemed to be arguing and then Liam gave Louis a shove.
A fan told the Daily Mail: "Just towards the end it was obvious that the band had a routine and were supposed to be in certain places at a certain time. They were all there except Louis...Liam came forward to sing something and Louis was blocking his way - I would say pretty deliberately."
The eyewitness added: "He had had enough by this point. He pushed him quite hard and you can see him saying 'stop it.' He pushed him quite aggressively."
Um. No. Just no.
A One Direction rep set the record straight, telling MailOnline: "What a load of rubbish, they are obviously just messing about on stage. It's banter. Anyone that has seen the band perform will know this."
Liam tweeted about the whole sitch (and we swear we can hear him laughing in these comments):
Simply the funniest story I've read to date clearly the person who wrote this has never experienced friendly banter in their life— Liam (@Real_Liam_Payne) October 5, 2015
http://t.co/kFvOwC1EOI ... OH MY GOD THATS SO OUTRAGEOUS HOW DARE I HAVE A JOKE WITH A FRIEND ON STAGE— Liam (@Real_Liam_Payne) October 5, 2015