10 Perfect Movies With One Glaring Flaw

10. Do We Really Need Time Travel? - Looper (2012)

Rian Johnson's twisty hit Looper is a great little film in which hitman Joseph Gordon-Levitt clashes with his older self (Bruce Willis) whilst both grapple with a devastating future.

The mechanics of Looper's premise comes from its time travel, in which people are sent back in time to be killed, so their murder is easily cleaned up. Gordon-Levitt is one of the killers tasked with disposing of future targets, a job that becomes too personal when his future self is sent back.

It's actually quite clever the way Looper constructs itself -- when Gordon-Levitt is hurt, Willis gets hurt too -- but the idea that people need to be sent to the past to be cleanly killed is slightly dampened by the fact that the villains kill Willis's wife in his timeline, and easily cover it up by setting a fire.

If it's that easy to cover up a murder when you're an all-powerful, time-manipulating gangster, why bother sending people backward in time at all?