Star Wars composer John Williams didn't know Luke and Leia were siblings when he was scoring the first movie – and to be fair, we're pretty sure George Lucas didn't know either.
"I mistakenly wrote a love theme for Princess Leia and Luke Skywalker," Williams told Variety. "I learned later that they were brother and sister, so it was an incestuous idea to have a love theme for them. But George never told us there was going to be a second film!"
