Mark Zuckerberg and Elon Musk agree about having a cage match.

Tech billionaires Mark Zuckerberg and Elon Musk have engaged in a light-hearted exchange on Twitter, discussing the possibility of a cage fight.

Musk expressed his willingness to participate, and Zuckerberg shared a screenshot of the tweet.

Musk then suggested the fight take place in Vegas' Octagon, referencing the UFC competition platform.

Musk continued, saying, "I just lie on top of my opponent and do nothing in a move I call ''The Walrus."

But later posted videos indicating the challenge may not have been entirely serious.