Plenty of movies over the years have earned surprising ratings, but these classic PG movies would obviously be R-rated today.

Premiering in May 1999, SpongeBob SquarePants continues to be Nickelodeon's most popular and profitable series, and the SpongeBob SquarePants movies and ... of the highest-rated, most-viewed ...

The MPAA has rated more than 17,000 movies R in the past five decades. Fewer than 5,000 have been rated PG-13, a rating introduced in 1984. In total, the MPAA has rated 29,791 films, meaning that ...