My friend would have no idea who Yoda was.
And sadly she raised her kids that way. When Harry Potter was huge her kids had no interest in it because it was "stupid" even though they were the age when all their peers were Potter mad. My friend has seen one movie that has sci fi in it, Men in Black. She told me afterward that she could not understand anything about it, "there were these things called aliens.. it made NO sense."
I don't tell her when I go to cons because it would take half an hour to explain at the end of which she would be baffled.