CinemaScore is a platform that collects data from people who have seen a movie on its first screening in a theater. When people leave the screening, they are asked to give the movie an A, B, C, D or F grade. If they loved it, they give it an A; if they hated it, they give it an F. In CinemaScore's 45-year history, only 21 movies have received an F so far, and not all of them are considered terrible movies. Let's take a look at the movies that failed with these F grades