Watch Tobias Jesso Jr. Cover 'Ghostbusters' Dressed as Sasquatch

Douglas Gorenstein/NBC
Tobias Jesso Jr. performs with The Roots on The Tonight Show Starring Jimmy Fallon on Feb. 26, 2015.

Tobias Jesso Jr. pulled out all the stops during his show last night (Oct. 30) at L.A.'s Fonda Theater, giving the show special Halloween flair by performing in costume -- see his Sasquatch outfit -- and adding a cover of the Ghostbusters theme to the set list.

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He was also joined onstage by all the members of Haim, who happened to be in the audience. Jesso has been covering the band's single "Forever" at many of the stops on this tour, so it made perfect sense for them to perform the song with him. Watch their duet below, as well as Jesso's one-off rendition of Outkast's "Hey Ya":