Guan Yu

He is worshiped as a guardian god to some, god of brotherhood and loyalty to others, and sometimes as one who protects the money of the upright from the crooked. He was also a real person: a general during the late Eastern Han Dynasty.

During one of his battles, Guan Yu was struck by a poison arrow in his arm, and although the arrow was immediately removed, the poison had seeped into his bone. His subjects sent away for a physician, and none other than Hua Tuo came to the rescue.

When Hua Tuo arrived on the scene, Guan Yu was busy playing Go with one of his men. Hua Tuo examined his wound, and said that surgery would have to be performed immediately to save his arm. He suggested that Guan Yu put is arm through a ring that was fixed to a post - to keep him from flailing around while Hua Tuo scraped at his bone (without anesthesia) - and to put on a blindfold.

Guan Yu was like, "No way dude! Do what you need to, I'm going to keep playing this game of Go." Supposedly, he didn't want to affect the morale of his men, and talked and drank without flinching while Hua Tou scraped at the bone in his arm.

Minutes later, Hua Tou put medicine (presumably herbs) into the wound and sewed it up. Guan Yu no longer felt any pain in his arm, and Hua Tou left without accepting rewards for his work.