Tonight Show host Conan O'Brien talked openly about the head injury he suffered last week on the show and unveiled the video of the incident when it happened.

During a chapter on last night's episode, O'Brien recalled the accident which happened as he was crossing the finish line of a triathlon with guest Teri Hatcher on the studio. After he fell backwards and hit his head, he was unable to answer basic questions and had to be taken to the hospital.

Watch the video below: