Jimmy Fallon is more than just a late-night host: he's also a musician. Following in the footsteps of Adam Sandler, Fallon used Saturday Night Live as a sounding board for his song parodies and mashups, but he also wasn't afraid to write his own original tunes. Behold "Idiot Boyfriend," Fallon's single that pays homage to the music of the '70s in a falsetto that belts out lyrics like "I made out with your best friend the other day, and now we're best friends too!" The video is equally funny, starring Zooey Deschanel as the girlfriend who has to cringe as said idiot boyfriend embarrasses himself with a karaoke dance party in front of her family. Believe me, it's even more absurdly wonderful than it sounds, so gear up for Jimmy's Emmy hosting gig with a few laughs from way back.