There are certain scenes from movies that have become so famous and iconic everyone recognizes them whether they've actually seen the movie it's from. There are a lot of them but what instantly comes to mind when you think iconic movie scene?
Personally I think of the "I could of been a contender" scene from On the Waterfront is the most iconic, followed by
The Rocky training montage
E.T. and Elliot on the flying bike going past the moon
"No I am your Father" the Empire Strikes Back
The shower scene from Psycho
What are your most iconic movie scenes?