Primer

There's a point in this film where it loses all coherence. When the narrator takes hold of being the driving force in the telling of the narrative, it begins to become hard to follow. I also felt like the two men went about this technology they had developed in a totally unprofessional and foolish way. Why on earth would you intentionally deceive your partner in work when working with something as fragile and uncertain as time travel? The main characters brought upon themselves all the problems they encountered. Had they not decided to go and punch some guy in face, none of their problems would have happened and they would've been able to create real and important social change. They initially talked about mass transit and space travel and settled for conning the stock market and March Madness brackets.