I was 7 in 1977 when i first saw Star Wars, just the one time in the cinema, and I distinctively remember having arguments in the schoolyard about a false memory of an image of Darth Vader's head super-imposed over a star-field at the end of the film saying " I Will Return ! ".
It was a full 3 years before i saw the film again in a re-release, long before home-video and Television screenings. but i think my memory was a composite of the multitude of star wars merchandise commercials that flooded our TV screens flogging everything from Action figures, to ice creams, shoes etc. it was full on Star wars mania. I also had a T-Shirt with Vader's head emblazoned over a starfield with the words Darth Vader Lives