06/04/2013 09:01 am ET

Most Confusing Movie Ever? '2001: A Space Odyssey' Tops One List

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What's the most confusing movie ever? According to ScreenCrush, it's "2001: A Space Odyssey."

Stanley Kubrick's 1968 science fiction film grossed $56.7 million, making it the 132nd most successful movie at the box office when adjusted for inflation. Starring Keir Dullea, Gary Lockwood, William Sylvester and Douglas Rain, the movie was written by Kubrick and Arthur C. Clarke (Clarke also wrote "The Sentinel," which the movie is based on).

The list caused some discussion on Reddit, where users weighed in with the following observations:

2001 is a rather unique bird. You have to read the book as well, because, get this: The book and the movie were being written and filmed simultaneously as a collaboration between Clarke and Kubrick. Despite that, some differences made it into the book that weren't in the movie and unless you watch the one and read the other you won't have the full picture of the work. - stowvan

The list also includes "Memento," "Donnie Darko," "End of Evangelion" and a few classic movies. Click over to Screencrush to see how they ranked, and to Reddit for more fan commentary. But first, weigh in below and let us know if you agree:

Summer Movie Preview 2013