It's not so much of a problem today, but years ago, car designers liked to incorporate design elements from years' past, even though the original features didn't exist in the newer cars. What's the worst design conceit ever?
We're going with the "rumble seat" bulge at the back of the second-generation Cadillac Seville. Never mind that the Seville didn't have a rumble seat, but that thing just looked ridiculous hanging out back there. The visual tension was so great, that someone even built a custom Seville with an actual rumble seat, just for comic relief. Oh, there are more.
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