Best romance movie stupidity of 1989

Please vote as you browse around to help the best rise to the top.

The Little Mermaid picture

Stupidity: Apparently, Ariel forgets how to write when she gets human legs. Ariel was able to sign a scroll underwater, but she apparently cannot do so to inform prince Eric of her identity.

Upvote valid corrections to help move entries into the corrections section.

Suggested correction: We see Ariel sign in English, but most likely they have an entirely different alphabet and language from our own.

More The Little Mermaid stupidity