The UFC Summer Kickoff press conference started off civil enough until Kevin Lee mentioned Michael Chiesa's mom and then all hell broke loose.
Chiesa stood up from his chair and told Lee to never bring up his mother. Unfortunately, that wasn't enough of a warning, and after Lee mentioned his mother again, he ran across the stage and a fight ensued. Lee had thrown a punch before security interrupted the scuffle and Chiesa stormed off stage.
Luckily for us, the drama continued long after, as Twitter re-lived the moment that may very well have sold their upcoming headlining bout at #UFCOKC.