Movies about movies

You know how in Team America: World Police, there's that awkwardly, hilariously long puppet-sex scene? Seriously, it goes on for like eight minutes. Would you believe that we can thank the bizarre requirements of the MPAA ratings board for both the inordinate length and colorful nature of that scene?

This and many other fascinating facts are explained in This Film is Not Yet Rated, an investigative documentary about the ratings system that I highly recommend.