Good scary movies for 12 year olds?

We are having a sleepover and want to watch a scary movie! It will be our first scary movie :D We don't want it to be too scary, and nothing too gory. We want a good scary movie that is not too long and pretty scary. Remember, we are only 12 so don't give us a scary movie that will scar us for life!! We prefer that the rating of the movie is PG13 or less because our parents don't want us to watch R.