Fuller House fans went wild during the duet
Credit: Twitter

What ever happened to predictability?

Bob Saget – aka doting, neat-freak single dad Danny Tanner – surprised Carly Rae Jepsen fans by joining her at a Milwaukee concert to sing the Fuller House theme song Friday night.

The pop star’s rendition of “Everywhere You Look” – originally sung by Jesse Frederick for Full House – plays during the opening credits of Netflix’s reboot.

In a video of the duet, the audience screams as Saget, 59, jumps on stage.

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Though he struggled with the lyrics a bit at the beginning, Saget gave an enthusiastic performance and bowed down to Jepsen, 30, as the crowd went crazy.

Fuller House is streaming now on Netflix – and already got picked up for season 2.