There's an old American football saying that's goes something like this: "Three things can happen when you throw the ball and two of them are bad." If you're not a football fan, you may not understand this as a metaphor for convertibles, but suffice it to say that cutting the roof off a coupe and replacing it with a folding canvas contraption opens a veritable Pandora's box. The roof can leak. The body can rattle. Terms like "fit and finish" and "noise, vibration, and harshness" have a tendency to become pejorative. But just as coaches still call pass plays, automakers still build convertibles. Because when everything goes right, there's nothing more exciting than cruising around with the top down (football excepted).