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.