47 yards from Tate Sandell as time expired lifted Oklahoma past No. 1 Texas 27-24 in the Red River Rivalry, sealing one of the season's biggest upsets.
Sandell then grabbed an Oklahoma flag, planted it at midfield and celebrated with the Golden Hat and a double Horns Down as teammates carried him off.
Texas became one of three SEC top-10 teams to lose Saturday, and its first defeat exposed concerns after earlier escapes against Ohio State and Tennessee.
The Longhorns now head into five straight games against AP Top 25 opponents, leaving little time to recover from the loss that dropped their unbeaten start.