VIDEO: Watch The Roots catch ‘Saturday Night Fever’

Running an obstacle course in a full suit of armor against Johnny Knoxville would have exhausted most men, but Jimmy Fallon was so excited he could hardly contain himself when he brought out his musical guest on Monday night: Barry Gibb – or as he kept referring to him: “Barry F’in Gibb!”

Jimmy broke out an acoustic guitar for Barry to strum and the two ran through a medley of Everly Brothers duets. Then the piece de funk: Barry and an augmented version of the Roots set “You Should Be Dancing” on high boil.

“Whatcha doin’ on your back, aah?”

Who’s going to sleep after that?

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