However, they didn't perform any of the band's new songs off their album Four, as might be customary for most; rather, in the holiday spirit, they joined Fallon and the Roots for a rendition of "Santa Claus is Coming to Town."

Fallon took the lead at first on the initial verse, but soon the other guys joined in on vocals, donning corresponding Christmas sweaters because there's really no other way to sing the song. Niall Horan shook a banana while Harry Styles blared a kazoo and wielded a drumstick, showing particular restraint as there was no way he could wrap his hands behind his back while singing. It can be done!