A couple reasons!
¹ It’s a shock response: when people are scared or nervous and don’t know how to react, laughter is often an instinct, because it’s a thing we associate with good times and moods.
² It does actually release endorphins in the brain, that help alleviate pain! Much in the same way that swearing actually does help us manage pain, laughter does the same.
³ The parasympathetic & sympathetic nervous systems are complicated beasts, and sometimes… things just jolt them, and they hit any ‘button’ they can to manage the response. Sometimes, that’s laughter!
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