The pair went head-to-head in a lip sync battle.
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Fallon first took on House of Pain’s 1992 hit “Jump Around,” while the former NBA star tackled Bobby Brown’s 1988 smash “My Prerogative," with a little help from Pitbull, who was the night’s musical guest.
“I’m bringing 1988 back,” O’Neal joked.
Fallon followed O’Neal’s performance by transforming (sort of) into Ariana Grande and John Legend to deliver his own rendition of “Beauty and the Beast.”
O’Neal finished the battle with Elton John‘s 1993 single “Don’t Go Breaking My Heart.”
He hilariously forced Fallon to join him for a duet
