What is the saddest song/songs you know?

I've been feeling really blue for the last couple of days now that Christmas is over, but I haven't really been helping myself by listening to sad songs.

As a musician I know "sad songs" are subjective, but for me the saddest songs I've been listening to recently are "Galveston" (Glen Campbell) and "Yesterday" (the Beatles).

Other songs that make me cry are "Racing in the Street" (Bruce Springsteen), "Tom Traubert's Blues" (Tom Waits), "The Long and Winding Road" (the Beatles), "These Days" (Jackson Browne) and "My Man" (the Eagles).

Anyone care to share songs that make them cry?