There are a few things that you just don't do in football.
You don't let Arjen Robben cut inside. You don't challenge Mike Dean's authority. And you don't ever steal Ty's hat.
If you're reading this and don't know who Ty is, you're probably not an aficionado of Arsenal Fan TV.
The supporter channel is many people's go-to, especially after a Gunners defeat like the one they suffered at Chelsea today.
Plenty were preparing for rants about Arsene Wenger and his squad, but were greeted to an altogether nastier spectacle before the interviews had even begun.
Ty was in the thick of a back-and-forth between rival fans when some Chelsea supporters, or so it seemed, reached towards him and snatched away his headgear.
He had to be restrained as the Blues made off with it, just as their team had made off with all three points at Stamford Bridge.
https://twitter.com/Cjukes26/status/827899152487108608
Plenty of observers didn't see the funny side, with Arsenal and Chelsea fans alike calling people out of order for their behaviour.
Arsenal had just been beaten and emotions were running high, but plenty felt this was entirely unnecessary.
https://twitter.com/tammyabramovic/status/827903383059255301
https://twitter.com/hezza3000/status/827901743090511872
https://twitter.com/vytzemaitis1/status/827902608140546049
https://twitter.com/SOA_1995/status/827911720458915842
https://twitter.com/simplyarsenalfc/status/827903537866739712
Catch up with this week's episode of 888sport Football Friday Live
