Primer

Primer (2004) is the greatest time-travel movie ever made. It's only about an hour long, so I encourage everybody to go and watch it. I will type up my explanation of exactly what happens in the movie when I find some time. Here's a copypasta that captures my views pretty well:

Here's why Primer is the ultimate time-travel movie

• It's not the squiggle chart: As interesting and fun as it is to decipher and analyze the chart - more lines on a timeline explanation chart does not equal a better movie.
• The low budget helps: There are no big stars, no special effects, the film is set in a generic everytown. Nothing prepares the viewer for what's about to unfold.
• Shane Carruth and David Sullivan: They are everymen, perfect in their roles. They are engineers and they act like intelligent people. They don't insult anyone's intelligence. Relatable.
• Minimalist soundtrack: Relates to the budget, but the soundtrack often cues the audience what to feel. In this film, there are gaps with no soundtrack where tension rises. Brilliant!
• Innovation: Nobody has ever seen time travel done exactly this way.