The Thai considers his head to be sacred, probably because the head the seat of an individual "Khwan" It is intangible and is preeminent, and that is what makes the present misery or happiness. If, for some reason, not Khwan is not leave. There will be a catastrophic illness or misfortune, and if the spirit back into the body must have the means to make amends ceremonial ritual to soothe back to the owner.