Sure, it's no "Merry Xmas Everybody" by Slade, or "Last Christmas" by Wham—but Mariah Carey's "All I Want For Christmas Is You" is up there with the greatest, most overplayed, kinda-annoying-but-also-kinda-awesome Xmas songs we are subjected to every holiday season. In other words, it really gets us in the mood for tinsel and mistletoes, even if it's 60 degrees out. Last night, Carey dropped by Late Night with Jimmy Fallon to perform the song with Fallon, The Roots, some adorable kids, and a bunch of knick knacky classroom instruments. Watch the sweet video below.