Brian Earl Spilner said:
I can't imagine how awesome it was in the theater when Han showed up out of nowhere and shot those TIEs out behind Luke.
I'm old enough to have seen Star Wars when it originally opened. That was an awesome scene that often prompted audiences to openly cheer.
But it was nothing compared to the reaction we saw on opening day for Empire Strikes Back when Vader said "
Luke, I am your father." The collective gasp from the audience was amazing. I've never heard anything like it in a theater since. Then you heard people all over muttering "but that's impossible" and then Luke echoed the audience, also saying it wasn't possible. You could hear a pin drop when Vader tells him it true, to search his feelings, and the dawning of tragic truth shows on Luke's face. Jaws across the theater were wide open in shock.
The rest of the movie was just a blur after that shock. For those who had seen it, it was all we could talk about for days. There was no internet so secrets like this could stick until people saw the show, and as your friends went to see it that scene was all they wanted to talk about for days.
That was one of the greatest moments in cinema history.