"Do They Know its Christmas" --- guilting people since 1985
YES! way to guilt people, feel good holiday cheer music 
The funny thing is that some of the stuff they're guilting you over isn't even true! They claim that "the only water flowing is the bitter sting of tears" (or something like that; don't have the lyrics in front of me), but Ethiopia is the source of the Blue Nile River, the tributary responsible for most of the Nile's water and fertile soil! (
http://en.wikipedia.org/wiki/Blue_Nile) Also, given the long history of Christianity in Ethiopia (
http://en.wikipedia.org/wiki/Religion_in_Ethiopia), I'd say they definitely "know it's Christmas."
(I know, I know, I'm letting facts get in the way of a good story!)
As for songs I hate--"Little Drummer Boy" and "Christmas Shoes" are at the top of the list. I'm with Dave Barry on the little drummer boy--if I had a newborn baby asleep in the house and some kid was standing in front of him whacking on a drum set, those drumsticks would be going up
his "rum-pa-pum-pum."

Any song played to make people feel guilty for having fun at Christmastime.
Double POD.