Apples and oranges are both fruits, and you can juice both of them! They're not that different. Anyway, I don't have a boat. Don't sailors have to file plans with an authority? Can they just wander around the seas endlessly? Isn't that a recipe for disaster? Not knowing what you're reading is a similarly bad idea, IMO. You think you're going to read a comedy, but it ends up being a tragedy, which you would've seen coming and avoided if you'd checked the last page first!