Last night on "The Tonight Show," Jimmy Fallon, the Roots and One Direction went full force with holiday spirit: They sported ugly sweaters, good cheer and belted out a great rendition of "Santa Claus is Coming to Town" (played on classroom instruments, of course).
Even a Grinch (like me) will bob along and crack a smile. Watch below:
Sarah Gray is an assistant editor at Salon, focusing on innovation. Follow @sarahhhgray or email email@example.com.