Autonomous Sensory Meridian Response, or ASMR, is a curious phenomenon. Those who experience it often characterise it as a tingling sensation in the back of the head or neck, or another part of the body, in response to some sort of sensory stimulus.
https://www.theguardian.com/science...-and-head-orgasms-whats-the-science-behind-it
Wear headphones for it to work best.