World Series of Fighting (WSOF) presented WSOF 29: "Gaethje vs. Foster" on March 12, 2016 at the Bank of Colorado Arena in Greeley, Colo. The main event was a lightweight title defense for the undefeated Justin Gaethje against top contender Brian Foster.
Gaethje made quick work of Foster, finishing him with leg kicks at 1:43 of the first round, which led him to do a backflip off the cage to celebrate. Unbeknownst to the fans, the Colorado State Boxing Commission (CSBC) warned him in advance not to do his trademark celebration if he won.