From Google: "What causes you to laugh? Laughter starts with activation of the ventromedial prefrontal cortex, which produces endorphins that are intended to alleviate pain. One study showed that within four-tenths of a second of exposure to something potentially funny, an electrical wave moved through the cerebral cortex, the largest part of the brain.Oct 5, 2018 What does the brain do when you laugh? Laughter enhances your intake of oxygen-rich air, stimulates your heart, lungs and muscles,...