The health benefit of watching scary movies depends on how scared you feel while watching it.
The person who watched the scariest movie leads to calorie-burn (184). This is roughly what a 140-pound person would burn if he/she walks for 40 minutes.
This happens due to the release of stressful stimuli, which causes the release of adrenaline hormone. It gets your heart racing which draws reserved energy from your body.
Boosts Immune System
Watching a scary movie can also boost your immune system for short term by increasing the blood circulation and white blood cells (fights infection). This increases the fight-or-flight response of the body.
Elevates Your Mood
The arousal of negative stimuli improves mood significantly. People feel less anxious, less frustrated and happier after they watched a scary movie.
People who don’t feel the thrill after watching a scary movie won’t experience the above-mentioned benefits. To enjoy the benefits of scary movie one needs to feel scared while watching it.