Sometimes "bad ideas" become vital bits of DNA that form the makeup of a car's brand. Something that, if it were ever improved on or removed, would ruin what makes the car special? What "bad idea" is essential to a car's character?

Even in the modern age of continual improvement leading to more-efficient products (and better 'Ring times), some cars retain enduring features that give its rivals' fans lots to crow about in forums. And the natural answer is this: The Porsche 911's rear engine. While the company has already created a superior sports-car platform, that of its mid-engine Cayman, 911 fans would rather die than drive something in which the power supply isn't teetering out over the rear axle. And so, the car's engine placement endures, giving Porsche's flagship the weird, wild rotational deliciousness that's become a drug for so many. I'd hate to see it go. (Thanks to Chairman Kaga for today's QOTD!)

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