Fear Factor was an iconic competition show back in the early aughts, forcing contestants to face their fears in pursuit of a grand cash prize. Facing those fears wasn't for the faint of heart, with challenges ranging from physically challenging to downright disgusting.

As far as Fear Factor hosts go, Knoxville makes a lot of sense. Joe Rogan infamously hosted the show during its initial NBC run, but while his podcast has turned society into a fear factory producing vaccine skepticism and Holocaust denial,

“Fear Factor” has a long lineage. The series was originally hosted by Joe Rogan on NBC, then by Ludacris on MTV. Over the course of each episode, contestants vie for thousands of dollars by taking part in stunts that may involve physical challenges, gross-out demands and even extreme-action scenarios.