Hi all, I noticed Paul mentioned the splashing-water-on-the-face trope again and thought I'd briefly go over the Mammalian Diving Reflex for everyone. During immersion in water, this relflex works to slow the heart rate, constrict blood flow to the arms and legs, and increase blood flow between the heart, lungs and brain. Now, this reflex is stimulated by nerves in the nasal cavity responding to sudden temperature drop. So, splashing cold water on the face will trick your body into thinking its going underwater, and cause an up to 25% decrease in heart rate, while hyper-oxygenating the brain, creating a feeling of calm. But its still an overused movie cliche.