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Yes, it can. The effects are more prominent on children and adolescents than it is on adults. However, many adults do not escape the negative consequences of watching horror movies.
Most horror movies contain strong visual and audio violence. It's either filled with killings, dark magic, witchcrafty, graphic violence or pain. The scenes are constantly characterized with negative events.
The mind is affected by what we read, see, hear or feel. After seeing horror movies, even though you may not really paying attention to the happenings aftermath, still suddenly there's this subconscious thought and perception we begin to hold about what we've seen.
Sometimes, we begin to imagine the possibility of it, some people even visualize themselves in the scenes.
After a while, some people may completely forget most of the events while others dwell on them virtually everyday of their life. Horror movie can breed fear, give a wrong perception of what is not real or true, or solidify what one held to be the truth and reality.
Subsequently, others suffer trauma and begin to dream about some of the creatures they saw in an horror movie. Some even fall into trance with wild imaginations.
If you are highly vulnerable to possible aftermath effects of horror movies, I would recommend that you limit the amount of horror movies you "consume" or completely do away with them.