One Direction and Jimmy Fallon Do ‘Santa Claus is Coming to Town’ with Ugly Christmas Sweaters and Classroom Instruments

Mariah x Jimmy
Mariah Carey sings her hit holiday song with classroom instruments.
The boys of One Direction are really making the most out of their time in the Big Apple.

Fresh off the heels of Saturday Night Live, Harry Styles, Liam Payne, Niall Horan, Louis Tomlinson and Zayn Malik dropped by The Tonight Show for a little classroom instrument fun.

Clad in the cutest and ugliest Christmas sweaters, the dudes joined Jimmy Fallon and The Roots for a performance of “Santa Claus is Coming to Town.”

It’s safe to say that some of the guys were more into it (Niall and his banana shaker) than others (basically, all of the second row). Still, what  a great way to kick off Christmas Eve Eve this fine morning.

Watch it all go down, above.