My choice would be...
The car from Back to the future
What would yours be?

Any of the Bat Mobiles, especially The Tumbler from the Chris Nolan trilogy.
...but of course having just come back from the future, you knew I was going to say that

A 1904 Darracq as seen in the 1953 Comedy film Genevieve.
If only the Louwman Museum in the Hague in the Netherlands would sell it to me
The Shelby Mustang GT500 from the 2000 Gone in 60 Seconds remake.
A real one though, not one of the movie replicas
