Even former UFC champions are doing it Gangnam Style.
In the wake of this PSY video taking over the Internet, everyone from Britney Spears to a mother and son combination on Ellen are doing a version of the wildly popular dance.
And that include Rampage Jackson, who told radio talk show host Ariel Helwani this week that he watched the video "twice a day" and then set out to prove it.
Watch him try his hand – and feet – at the dance now: