Okay, who's heard someone misremember the iconic line as "Luke, I am your father"? On some level, it makes sense that so many people collectively insert a "Luke" into Vader's revelation. Heck, plenty of people even tack on a "come to the Dark Side; we've got candy" at the end of the reference — and that certainly isn't in the movie.
Yet without the Luke context, the quote packs less of a punch. Sometimes, quotes just take on such a life of their own that people seem to forget the original. Let's face it: Most people have heard the line incorrectly referenced by friends, family, and even strangers more often than they've seen "The Empire Strikes Back." As a result, the butchered version of the line is fresher in fans' minds than the actual scene. It's just one of those quirky human things that happen. Just ask the Berenstain Bears (or is it actually the Berenstein Bears)?
The real-world term for these collective hiccups is the Mandela Effect which essentially posits the possibility of an alternate universe that we're seeing glimpses of in our own reality. And sure, alternate universes sound cool, and all, but simple explanations are usually the right ones.
