Steve-O lets former UFC fighter knock him unconscious in wild scene

"Jackass" star Steve-O has never been one to back down from a challenge, which includes a chokehold by a former UFC champion. 

Michael Bisping, who is now an analyst for the combat sport, stepped back into the octagon at UFC APEX Center in Las Vegas on Saturday for a challenge Steve-O and YouTube star Stevewilldoit decided they wanted to partake in. 

Joined by current middleweight fighter Marvin Vettori, the UFC fighters’ goal was to make Steve-O and Stevewilldoit tap with a chokehold. While Bisping and Vettori are both retired from the sport, they were game for a little fun.