When a person’s head hyperextends downward into a shampoo bowl, small tears may occur in the small blood vessels of the neck. Blood may clot in these tears and later be released and go directly to the brain, causing a massive stroke. This could be prevented with the use of Shambowli® . No hyperextension of the neck means no tears in the small blood vessels of the neck. No tears, no blood clotting; no blood clotting, no Shampoo Bowl Stroke Syndrome.