It's about Autonomous Sensory Meridian Response.
Once known as brain tingles, or brain orgasms, the term was coined in 2010 to describe a phenomenon that can be triggered by sound. It can be experienced by around a fifth of the population
The effect is like a massage by sound, and experts have sought out, and found, a wide range of different ways to stimulate it.
From shaking sweets to cutting soap, crinkling wrappers or scratching cardboard, or even simply whispering.
NBC News' Left Field team, with a bit of help from Miss Candy, gave some different techniques a road test.