Tom Cruise and Cameron Diaz might want to think twice before reuniting for another film.

The stars of the box office disappointment Knight and Day are now being reminded of another title from their past.

According to a poll conducted by LoveFilm, 2001’s Vanilla Sky is considered the most confusing movie ever made. The surreal Cameron Crowe film - also starring Cruise’s ex-girlfriend Penelope Cruz - centered on a wealthy publishing heir (Cruise) who suffers from a series of strange hallucinations after a car accident.

David Lynch’s Mulholland Drive ranked second in the poll while Donnie Darko, directed by Richard Kelly, placed third.

“It’s clear dreaming is the biggest cause of confusion for viewers,” LoveFilm editor Helen Cowley said about the results. “Switching from reality to dream sequences pulls the wool over our eyes.”

The top ten Most Confusing Films of All Time are:

1. Vanilla Sky (2001)
2. Mulholland Drive (2001)
3. Donnie Darko (2001)
4. The Matrix Revolutions (2003)
5. Memento (2000)
6. 12 Monkeys (1995)
7. Eternal Sunshine of the Spotless Mind (2004)
8. 2001: A Space Odyssey (1968)
9. Revolver (2005)
10. A Clockwork Orange (1971)