We talk the 2004 Sundance stunner "Primer" directed by Shane Carruth. Intellectual engineers Aaron (Shane Carruth) and Abe (David Sullivan) build and sell error-checking technology with the help of their friends. But when Aaron and Abe accidentally invent what they think is a time machine, Abe builds a version capable of transporting a human and puts the device to the test. As the two friends obsess over their creation, they discover the dark consequences of their actions