I judge a book by it's cover.
Ok, not completely but you know, your mom always told you "You only get one chance to make a first impression." To me, the cover of a book is the "first impression". I am more likely to read the synopsis of a book if it has an interesting (or sexy) cover. That's not to say that I will actually read that book over a book with a less interesting (or sexy) cover. But the one with the cover that jumps out at me will be the one I pick up first.
How about you? Do you judge a book by it's cover? C'mon, you can share! I won't tell!