Remember, in American Sign Language (ASLJ) certain rules guides how to successfully pass a message. Thus, to say, "I watched the scary movie", would be shortened in American |Sign Language as "Movie scary I watched.
The reason for this difference in expresion is due to the fact that ASL places emphasis first on the object been spoken about before further information is given.
You know the saying actions speak louder than words. That is a easy way to understand that words spoken carry more weight than just writing something. Words spoke are a more genuine expression from the heart than just writing something.