The Octagon is for chumps.

Noted street brawler-turned-Bellator MMA fighter Dhafir "Dada 5000" Harris used Instagram to invite potential combatants to the "Trigone," a three-sided cage that looks a lot smaller than your usual combat sports apparatus.

The Trigone was actually innovated a year ago for use in the Back Yard Brawl Extreme Fighting Series, which has held one event to date. A BYB press release described the cage as "a ring just over 130 square feet with only three corners and 180 degrees of absolute mayhem."

Whether Harris is hinting at a second BYB show, generating new content for a sequel to his "Dawg Fight" documentary, or just ... being Dada 5000, the Trigone makes for a novel and potentially terrifying concept.