Which movie best defines your imagination? And how?

Being There with Peter Sellers. In it he plays a severely intellectually handicapped man who has spent his entire life living in isolation tending a garden only to suddenly be thrust out into the world. Just by "being there" and talking about gardening everyone assumes he is a genius and in the end he is elected president of the US. It is a classic representation of the "divine fool" who somehow manages to thrive just by being his humble self and somehow manages to straighten out every mess he encounters. Forest Gump is similar, but this is the real McCoy that makes Forest look pretentious.

I loved 'Avatar' movie, somewhat left me 'out of this world' for few days.