The Impractical Jokers Episode That Hurt Not One, But Two Cast Members

The episode in question is the Season 5 finale "Nitro Circus Spectacular," which saw several of the jokers taking on an X Games-inspired obstacle course to help raise money for a charity of their choice. During a 2016 interview with the "Tell Em Steve-Dave" podcast, Q revealed that he actually broke several ribs while preparing for the obstacle course, after accidentally flipping his quad bike.

As such, Q was unable to participate in the actual obstacle course competition, though his co-star Joe Gatto (who recently departed from the series after Season 9) smashed his head against a door during his attempt at the course and ended up staying on the ground for a few moments (via Talk Nerdy With Us). Despite his initial panic, Joe ended up being okay, and in fact, he later revealed on an episode of "Impractical Jokers: Dinner Party" that he actually stayed down because he thought he was going into cardiac arrest. 

In any case, the fact that two cast members suffered scary injuries during this stunt is probably a sign that they should leave that kind of physical comedy to the guys from "Jackass."