I have two - the order may seem sacreligious, but in #1 I was 22 years old, in #2 I was eight. Big difference.
1) When SW:SE released in theaters, me and my two closest friends traveled two hours to the best movie theater that we knew of. We did this on no sleep, laughed hystercially all day, and were absolutely blown away during SW. I was on the edge of my seat even though I had seen SW hundreds of times by then. The theater experience made a huge difference.
The last showing we went to that day involved a radio station having a little promotion based on what sort of merchandise the filmgoers had relative to the characters: weapons, action figures, costumes, etc. The DJ asked if anyone had Luke stuff, Vader stuff, Han stuff, Leia stuff, etc. Then the question came: "Does anyone have anything Chewbacca related?"
I don't know why, but I leaned forward in my chair and howled: "RRRRRRRAAAARRRRRGGGHHH!"
Hundreds of heads turned to me. That was quite an experience.
The DJ was tickled. "Hey, you! Come down here!"
So I walked down to the front of the theater and the DJ did a quickie interview: "Hey, what's your name?"
I replied, "vote_for_palpatine."
"Well, vote_for_palpatine," the DJ asked, "could you do that one more time for the folks here?"
Of course I could: "RRRRRRRAAAARRRRRGGGHHH!"
The theater laughed and the DJ handed me a free CD for my efforts. Good times.
2) I was eight years old in 1983 and I had only seen SW to that point, and that on TV. But my dad took me to go see ROTJ. I was in ecstasy the entire time. When the Millennium Falcon flew into the heart of the Death Star, I knew I wanted to be a dork for the rest of my life.