What causes footballers' red mist?
The recent League Two encounter between Bradford and Crawley ended with a post-match brawl and five players sent off.
But the big question is why do footballers just occasionally flip out?
Yorkshire & Lincolnshire Late Kick Off's Rob Jones has been investigating.
Late Kick Off is shown on BBC One on a Monday evening (2305 GMT).
You can also watch the programme again on the BBC iplayer via the Late Kick Off website.
This video is for UK users only.