What's Your Favorite Automotive Doppelgänger?

In fiction, the appearance of a doppelgänger often implies the presence of an evil body double. In car design, it usually just indicates derivative, unoriginal, or coincidental design. What's your favorite automotive doppelgänger?

The 1954 Fiat 8V Supersonic is a gorgeous car. The P1800 is also quite attractive, and one of the few truly curvaceous Volvos. The Fiat was designed by an Italian (Ghia body) and the P1800 was penned by a Swedish yacht designer. The P1800 was designed a few years after the Fiat, so it's possible the Ghia was an influence. It's also possible both of them looked to the designs of yachting watercraft for their small greenhouses over large bodies. Or it could just be a coincidence. Whatever the reason, they're both fantastic.

Find two cars, post them up, and maybe explain why you think they look the same.

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Question inspired by Zacarious, who actually asked a different question that inspired me to ask this one. So my question is his question's doppelgänger.