To those who watched the original Star Wars trilogy in theaters, how was the "Luke I am your father" fallout?

Did people see it coming? Did the entire community flip a shit? Did no one really care because the following wasn't cult-like yet? I've lived my entire life hearing "Luke I am your father" long before I was old enough to meaningfully watch those movie, and am curious how it would have been to have heard that line in its proper context.

Edit: and yeah I know it's a misquote, but it's how I always hear it quoted so bear with me

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