As a kid: Star Wars*, Lord of the Rings, Ben-Hur*
As a teenager: The Matrix*, Spider-man*, Nosferatu*, Amadeus, The Princess Bride, Blade Runner*
As an (alleged) adult: Groundhog Day, Hamlet (1996), Ran, The Searchers, Solaris*, Lawrence of Arabia
*In each case, the answer to "which one?" is "the real one." 
(Usually the first live-action one, or at least the first well-known one, as with Ben-Hur.)
