Making a great time-travel movie, as it turns out, is not very easy.

Quite a few films have tried and failed for a variety of reasons.

Some are silly, some are sweet, and some are just a hell of a lot of fun.

15-Best-Time-Travel-Movies

The Terminator

I mean, this has to be on the list right?

About Time

About Timeis certainly the most emotional entry on this list.

Idiocracy

You know, that movie that was ridiculous fiction until it kind of became reality.

Shane Carruth as Aaron and David Sullivan as Abe in Primer

Image via THINKFilm/IFC Films

And also the batin jokes.

DirectorAlfonso Cuaronshook up the aesthetic and narrative approach to the adaptation ofJ.K.

Star Trek (2009)

DirectorJ.J.

The Terminator aiming a gun at someone at a bar in The Terminator.

Image via Orion Pictures

Never one for the traditional, Gilliam keeps things delightfully strange throughout.

Domhnall Gleeson and Rachel McAdams as Tim and Mary about to kiss in ‘About Time.'

Image via Universal Pictures

back-to-the-future-2-social-feature

Image via Universal Pictures

Dx Shepard, Luke Wilson, and Maya Rudolph in Idiocracy

Image via 20th Century Fox

Bruce Willis and Joseph Gordon-Levitt in Looper

Image via Sony

Daniel Radcliffe, Emma Watson, and Rupert Grint as Harry, Hermione, and Ron, looking scared as Lupin transforms into a werewolf in Harry Potter and the Prisoner of Azkaban

Image via Warner Bros.

Spock (Zachary Quinto) and Kirk (Chris Pine) standing defiantly in the finale of Star Trek (2009)

Image via Paramount Pictures

Jeffrey and James looking in the same direction while at a mental isntitution in 12 Monkeys

Image via Universal Pictures

Rita Vrataski, a war hero dubbed the ‘Angel of Verdun’ looks over her shoulder while wearing a large mech-suit in Edge of Tomorrow

Image via Warner Bros. Pictures