Jimmy Fallon and The Roots are back playing with classroom instruments. This time they're joined by Andy Samberg, Akiva Schaffer and Jorma Taccone, aka The Lonely Island. While it's not nearly as good as Mariah Carey singing "All I Want For Christmas is You," I do enjoy the child-friendly alternatives to the many swears in the song (personal favorite: monkey funky). Well done, fellas.