No. 6 Oklahoma and No. 11 Texas had not yet taken the field for this year's Red River Showdown, but things got heated.
Players had to be separated about a half-hour before kickoff after the two teams met at midfield for some pregame jawing.
Every player was issued an unsportsmanlike penalty by referees, who warned the two sides that players will be ejected if they receive another unsportsmanlike flag during the game.
Unsportsmanlike conduct includes the "Horns Down" taunt, which coach Lincoln Riley told his players earlier this week to refrain from throwing.
The referee told players before the game that they need to respect each other during the "greatest rivalry in college football."
According to ESPN's Adam Rittenberg, Big 12 referee Mike Defee and the head linesman were hit in the scuffle. Defee said Riley and Texas coach Tom Herman were warned before the game.
Oklahoma beat Texas, 34-27, to remain undefeated (6-0).