You know it because it's happened to you.

You settle into your seat at you local multiplex, excited to see the latest movie starring your favorite actor. The lights dim, the projector kicks into action, the movie starts and then ... the person you came to see was barely in the film. Sometimes, the film is so good that you don't care or there's a reason why their role was limited. Other times, there's something a little more nefarious at work, and you realize that you've been tricked into seeing a movie by a marketing team who sold a supporting turn as a lead.

Their faces were on the poster. They were featured prominently in the trailer. But they had three scenes, tops.

Misleading film marketing like this has been around for decades. B-movies and exploitation pictures would shell out enough cash to get a former movie star to show up on set for a day or two, just to get their name on the poster. Sometimes the results are fine. Sometimes they're insulting.

[SPOILER WARNING: We discuss major plot points for films like 'Spring Breakers,' 'Seventh Son,' 'G.I. Joe: Retaliation' and more. Proceed with caution.]