Christmas comes early with what is possibly the only cool thing to ever happen on “Late Night With Jimmy Falon.” Jimmy joins The Muppets (along with The Roots) to sing a Christmas classic and to wish everyone Merry Christmas and happy holidays. Even if you can’t stand Jimmy, it’s worth the watch because the Muppet gang’s mostly here. If this doesn’t put you in the Christmas spirit then nothing else will. Not even Christmas liquefied and injected into your blood stream.