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That is because of how some people's nerves are routed. For some, the optic nerves are very close to the vagus nerve and may even share the same nerve sheath. The vagus nerve is what controls the heart, lungs, diaphragm, part of the vocal folds, and digestive tract. A sneeze is a spasm of the diaphragm. So when a very strong stimuli passes through the optic nerve, some crosstalk may occur and stimulate the vagus nerve, causing a spasm of the diaphragm and the sudden expulsion of air through the lungs and out the mouth. So if the mouth or lungs have anything in them at the time, it comes out along with the air, and thus saliva and possibly phlegm go everywhere.

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Q: Why do people sneeze when walk into bright sunlight?
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This phenomenon is known as the photic sneeze reflex, where exposure to bright light triggers a sneeze response in some individuals. It occurs due to a crossed connection in the trigeminal nerve, which is responsible for both the sensation of bright light in the eyes and the stimulation of the nasal passages, leading to a sneeze.


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