The clip I posted from When Harry Met Sally... reminded me of another good one, from City Slickers. In both films Bruno Kirby played Billy Crystal's best friend, and in the latter he had a poignant scene that stuck with me:
The play is knowing what you want, the act is pretending you know what you're doing and the curtain is knowing everyone is just a child who developed larger thoughts.
'Consciousness is not simply a sensory-perceptual affair, a matter of mental imagery, as the contents of our mind would have us believe. It is deeply enmeshed with the brain mechanisms that automatically promote action readiness' - Jaak Panksepp