Rule #1 of scary creature movies: if the first scary thing-in-the-dark turns out to be harmless (like a blow-up doll), the very next thing will be a throat-violating tentacle monster.

To appreciate this scene from 2001's The Day The World Ended fully, you have to know that the school principal (played by Elle's dad on Heroes) has a fixation on how kids' dolls should not be "anatomically accurate." [IMDB]