I wanna say ESB but:
EPISODE IV: A New Hope is my fav.
I was a newly minted 9 yr old and it just blew my away. It was a large chunk of my childhood!
BTW: 9 years old back then seems more like 6 these days, if my nephews are any comparison at all.
Times were simpler.
5 TV stations, Atari, school, sports.
No cable, internet, PCs, multiplexes, cell phones, etc.