I would have never guessed I will recommend a romantic movie, but here it is: Before Sunrise and the sequels Before Sunset and Before Midnight. (I haven't seen the third one yet, so the recommendation is for the first two.) I greatly enjoyed the movies, although I hate romantic movies in general. What was the difference? These movies are completely dialog-based. There is no long silence or dancing or such stuff; the protagonists are talking all the time, and they are irradiating high intelligence. Your frontal lobes will not starve while watching.

season one of Orphan Black: A very well-done right around the corner scifi setting, focusing on cutting edge biomodification and human cloning. The main character/s are all clones who were put up for adoption 20something years ago for unspecified purposes around the world who begin to find and interact with each other. The actress does an amazing job of playing similar but different versions of herself with different upbringings and capabilities. So far characters don't hold the idiot ball but are either legitimately fooled by conspiracies or make understandable mistakes.