El cuerpo and Palabras encadenadas
These 2 are the best psychological/mystery/thriller films i have ever watched.
When i watch these type of movies my mind is wired in such a way that subconsciously it runs faster than the plot trying to figure out the potential twists and to predict how events will unfold before they actually happen on screen, which many times actually ruins my watching experience. Fortunately with this one i was unable to predict the direction it would take and the final revelation left me awestruck, literally blew my mind.
Major props to the writer, he is a genius.