In the 1960’s the then head of styling and design at General Motors was Bill Mitchell who, having returned from a fishing trip having landed a mako shark, mounted his prize in his office and set out to build a concept car based on its image. 

Although it never made it to production, a model of the retro car is kept in the General Motors Heritage Centre in Michigan. What a shame they didn’t build a production version, for sure it would have been a classic.