The Matrix (1999) is set in a world where machines have control over humans, growing them in fields and using them as a source of energy to power the machine world. The life a human lives in this world is an illusion designed to keep the body alive so it will continue to generate electricity. Human beings are kept amused by the matrix so that they will be a battery.

The main character of the film is a rogue human who has become unplugged through the help of others who became unplugged. They made a choice to reject the matrix. Neo, is freed by these unplugged warriors because they believe he is a messiah figure who was predicted to come out of the matrix and save the human race. The film is his journey to becoming that messiah. 

This film is a good metaphor for how the study of society works. The matrix itself, as Morpheus states, "...is the world that has been pulled over your eyes to blind you from the truth." We live in a society of rules, expectations and roles that we are play out every day without thought as to why things work the way they do. Sociology is the study of those things we take for granted everyday of our lives. 

At the end of the film, Neo no longer sees the matrix in the normal way, but rather sees the code underneath. This allows him to control the code and thus to not be controlled by the code. He is not fully without constraints, but his knowledge that he is within a system and his knowledge of that system gives him power that others within the system lack. Sociology can be that powerful. If one understands why people interact the way they do and what within our society shapes that behavior, one is able to (a) not be as influenced or constrained by those social forces and (b) respond to others in ways that influence and shape their behaviors. There is knowledge in power.