I have another theory about all those quotes. Regarding that Darth Vader quote, if quoted exactly, i.e. "I am you father", it isn't immediately obvious the quote is from Star Wars. "Luke" gives you a context. Sherlock and Kirk quotes are synthesized from what the characters actually said, and arguably the precise wording doesn't matter, because the point of the quote is to bring up images of the characters and situations, not of those specific words.