1. You think it will make you famous.
2. You seek revenge on that 8th grade teacher who told you that you lacked creativity.
3. You're sure it will make you look thinner.
4. Everyone will say glowing things about you on Facebook, Twitter, and in fancy martini bars.
5. You need something to talk about at parties (i.e. "Yeah, I'm working on a novel.")
6. Someone told you that you should.
7. You figure you can, because now you have an MFA. You learned how, from other people who wrote books.
8. You figure you should, because now you have an MFA. That was an expensive two years!
9. You figure if you don't, people will say you've "lost your touch."
8. You figure you can, because you don't have an MFA. Your degree is from the University of Life.
9. You figure you should, because you don't have an MFA. That'll show 'em!
10. You want to write a book just like that author you love so much.
11. You have a penchant for the barfy smell inside of books that haven't been opened in a really long time, you own a library card catalogue, you spell catalogue with a "u" even though you're American, and the right kind of writing implement is is almost orgasmic to you.
12. You are two pages into your idea and you're already obsessing over who will publish it, thinking of clever marketing schemes, and looking for agents.
13. You like talking about the book more than the actual writing of the book.
14. You have a really great idea - teenage vampires!
15. You don't believe in rewrites, editing, or anything beyond spell check.
16. You had a dream in which the cupcake told you it was time to write your masterpiece.