Titling is a painful process forme. I want the title to express the mood of the story -- dark, nostalgic, impish, romantic, reflective, etc. etc. I also want it to pique the reader's interest. I'm even obsessive about my chapter titles, in the same way. I love any kind of wordplay, and when I can use that in a title I 'm a happy girl. I often use song titles or lyrics in my chapter titles, but for the title of the fic I will only do that if I pun it or change it some way.