A wrestler took things way too far during a match over the weekend ... stabbing a referee in the head with an iron spike so violently, the man was forced to go to the hospital.
The horrifying scene all went down at a World Class Pro Wrestling event in Irving, Texas on Saturday ... when Devon Nicholson -- aka "Hannibal" -- was taking on "Carlito."
Nicholson -- who runs a popular YouTube page that has over 300,000 subscribers -- and "Carlito" put on a show for several minutes .