These days, Keyshawn Johnson functions as one of the people who screams C’MON MANNNNNNNN on ESPN studio shows. There’s much more to the life of the former receiver, it seems. Apparently, he’s also been spending his time chasing down and intimidating reckless swaggy speeder Justin Beiber, and for that we salute him.

Keyshawn had just left a party Sunday night inside of his exclusive gated community in Calabasas (with his child in the car), when Bieber zoomed by in his Ferrari at breakneck speeds.

We’re told Keyshawn was furious — feeling Justin could’ve killed someone — so he brought his kid home, then chased after the singer in his Prius (yes, a Prius chasing a Ferrari).

When KJ got to Bieber’s pad — he blocked Justin’s Ferrari in the driveway and got out of his car to confront Justin face-to-face … but Justin ran inside of his house and refused to come out.

Don’t worry, Keyshawn. He’ll be back to finish this just as soon as his balls drop.