Gilbert Arenas vs Javaris Crittendon
NBA players take their card games, and subsequent gambling debts among themselves, very seriously. For instance, Gilbert Arenas and Javaris Crittendon’s initial argument started over a $1,100 pot in a game of cards they played as members of the Washington Wizards. The argument over said game continued on and on, only to get more heated as time went on. Eventually, Arenas threatened to settle the issue through the use of weapons, and followed through on that threat by actually bringing four pistols into the Wizards locker room, and telling Crittendon to pick one (and that he was going to shoot Crittendon anyway).
Crittendon instead brandished his own weapon, cocked it, and pointed it right back at Arenas. Eventually, teammate Caron Butler was able to help diffuse the situation, but the entire thing was just a culmination of a Wizards season careening off the tracks anyway.