system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Can snapping someone's neck in real life like in the movies really kill someone fast? If so why?
gpt
It severs the spinal cord, which prevents the brain from sending any signals to the rest of the body. Your lungs will be unable to take in air, your heart will immediately stop beating, and your brain will run out of oxygen very quickly.

It's the same way that hanging works when done properly. Snaps the neck, doesn't suffocate them.