Yesterday, Optus Stadium was home to the largest crowd ever at a sporting event in WA, with a record breaking 56,521 fans in attendance, but it can take just one for things to go too far.
Today, video footage has emerged showing a West Coast Eagles fan holding a Fremantle Dockers jersey in one hand and a match in the other, attempting to set it on fire.
WARNING: THIS VIDEO CONTAINS COARSE LANGUAGE
The man had some people egging him on, while others were calling him an idiot, before one woman is seen at the end of the video attempting to snatch the jersey out of his hands.
Did you go to the derby yesterday? When do you think banter and sledging goes too far? Let us know in our Facebook comments!