Some lab technicians who take blood for medical tests are so expert that all you experience when they insert the needle is acmesthesia — a sharp point pricking or piercing your skin, but no pain.
That’s probably also what is experienced by those people who can lie down on a bed of nails! Acmesthesia combines the word acme, which means "point or tip," with the Greek esthesia, which means "feeling." That second part might look familiar from the word anesthesia, a condition where you can't feel anything — usually because you've been given a drug, also called anesthesia, that puts you to sleep.