Sean was cage-side for the eventing when Du Plessis, who was sitting behind Sean a few rows, started smack-talking him.

Sean then got out of his seat and pointed his finger at Du Plessis, as if he were firing a shot. Du Plessis was clearly up for some action, telling Sean with his hands to bring it on.

Sean then goes ham, and asks the son of UFC fighter Gilbert Burns to move, which then cleared the path for Sean to jump over a couple rows and start attacking Du Plessis.

This is all the lead-up to what will probably be an epic fight between the 2 guys next month at UFC 297.

They were also at the UFC press conference Friday, where they had to be separated.