Everyone knows that tensions tend to run rather high when two heated rivals go head-to-head in any sport.
However, things rarely boil over quite to the same extent as they did in a lower-league Brazilian football derby at the weekend.
In a clash between Potiguar and Baraunas, both sets of players appeared to totally lose the plot, with the game descending into a shocking brawl that saw high-flying kicks aimed in every direction.
With carnage and chaos reigning all around him, the unlucky referee restored order by dishing out a total of eight red cards that left both teams to contest the rest of the match with seven men.
Potiguar went on to win 2-1 and the brawl can be viewed in the video at the top of the page.
Is this the worst on-pitch sporting brawl you have ever seen? Can you think of many worse? Watch the video and then let us know your thoughts in the comment box provided below....
Thanks very much to the folks over at The Metro for bringing this to our attention.