Competitive sport is always intense and tempers can flare at any time between opponents, but those intense moments can also boil over amongst players in the same team.
This week we've seen another example of infighting within an organisation during the Chicago Bears' OTAs. It was a four-man brawl Tuesday at the Bear that saw defensive ends Lamarr Houston and Jared Allen battle with right tackle Jordan Mills and tight-end Martellus Bennett.
In the end this fight cooled down and was labelled as just an example of how much the players wanted to fight to improve. However, some other sporting teammate altercation situations have exploded, like some of the ones on this list.