What Is The Frankenstein's Monster Of Cars?

Some cars have bits and pieces from other cars. But other cars are amalgams of parts bins from across the auto industry. What cars are rolling Frankensteins?

We're talking about part sharing to the extreme here, like pieces of multiple cars to create one monstrosity. Something like the VW GTI W12 650 concept.

Now, this was just a concept, but it ran. And it had a Golf body with bits of Audi, Bentley, Lamborghini, and the rest of the VW group parts bin. It's a glorious example of what aggressive parts sharing can accomplish.

What are some of the best, and worst, Frankencars ever created?