I don't get it

On the topic of Serenity, it always amazes me that there are people who provide extremely detailed descriptions of the "bad" content in movies for other parents to screen. Parents who would actually read such a long article before letting their child see a movie have way too much time on their hands. Some of the horrible things in Serenity include (these are all actual quotes):

• Smoking—A miscellaneous character smokes something in a bar/club that could be construed to be drug-related, but it's never identified one way or the other.
• Blood/Gore—River has a small red hole or mark on her forehead from where a device was attached to her.
• Frightening scene—Simon applies a shot to Mal's forearm, but we don't see the actual insertion.
• Frightening scene—The crew endures a rough and shaky landing in their spaceship.
• Imitative behavior—[Wash says] "I'm a leaf in the wind."
• Music—A heavy amount of suspenseful, dramatic and action-oriented music plays in the film.
• Sex—We see a miscellaneous shirtless guy.
• Violence—Mal and Jayne throw grenades at approaching Reavers, but we don't see the explosive impact.

The author is totally right—the PG-13 Serenity definitely includes a lot of mature content that a thirteen-year-old child wouldn't be able to handle.

(Those, of course, were carefully selected for my own amusement. I left out the parts about vibrator use, the prostitute training school, machine guns used on zombies, and the constant flashes of pictures of rotting corpses: things that parents really might not want their young kids to see.)