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A crushing left hook to the back of the head knocks down a boxer. he "sees stars" because:

User Eric Wong
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When you get hard enough and it knocks you out, it makes your brain hit the inside of your skull. While this is happening you a quick flash of darkness envelops the senses as the body shuts itself down and does a quick reboot. The quick flash of darkness is when you see "stars".
User EOB
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