I've often pondered this exact question. It is almost impossible to pick a favorite song off charm school, but if I did, it may be Ghosts are Good Company.

I remember when I dragged a person to their first concert when they came through Dallas, as every song started I would turn to her and say "this is my favorite, I love this song". I proceeded to say that the whole concert. After the concert she was a BA fan, she'd never heard them before.