Watching movies cannot really be classified as sin. What really matters is the kind of content that we expose ourselves to because for everything that we see or hear they have a way of affecting us either consciously or unconsciously.
As believers we need to be mindful of the things feed our eyes and ears with. We should do things just for the fun of it only, we should be more interested in things that builds us up both intellectually and spiritually.
Inasmuch as watching movies is not a sin but we should be very mindful of the ones we give attention to so that they do not affect our thoughts, actions, and desires on the negative.
If there is one characteristic we possess as humans is the ability to adapt. We are teachable. A lot of people subconsciously behave in certain ways because of the things they were thought in movies. How to know if a particular movie is not right from us is it it's one that pulls us away from God.
Everything we consume should be for the purpose of growth. We must make sure that every second of our time is passes by should be as an investment and not a waste. God never liked waste. Our time should be properly utilized
