Some of my favorites:
You should read the book you find in your grandparents’ house that’s inscribed “To Ray, all my love, Christmas 1949.”
You should read the book that you didn’t read when it was assigned in your high school English class. You’d probably like it better now anyway.
You should read the book that your history professor mentions and then says, “which, by the way, is a great book,” offhandedly.
You should read the book that you find on the library’s free cart whose cover makes you laugh.