Worst Movie That Earns an "F" From Audiences?

A "F" from Cinemascore movie audiences is a rare occurrence and indicates a movie strongly disappointed its core audience. Furthermore, "F" scores from opening night theater audiences can be the "kiss of death" for a movie. The score virtually guarantees a short theatrical run and limited box office, by scaring off potential patrons once word circulates about the movie. Since 1999, only about twenty films have received the bottom mark which averages out to just over one movies per year. Source: Cinemascore F Rated Movie List Wiki

Which select film that scores a rare F Cinemascore with movie theater audiences is the most deserving* of its failing grade? *biggest disappointment or alternatively, the least worth the price of a ticket

Take the companion poll: Best Movie That Scores an A+ With Audiences?

Discuss the topic here.