Here’s the newest comic from xkcd describing character interactions in a bunch of movies.
That Primer one is 100% correct. If you haven’t seen the movie, I suggest you watch it. It’s a great movie. You may not like it, but at least you’ll know how it feels to get raped in the brain after watching it. Raped. In the brain.
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Primer changed my view on Time Travel. I used to think it was cool. Now I know it's just annoying. Thanks Primer.