Details: This poster says at the top Ninja tips for Healthy Living . It has a list of Ninja Tips, including Killing the wrong person happens. Ninjas know this. It's useless to live in the past. and Ninjas occasionally, without warning, stab friends with throwing stars. Life is random. Ninjas embrace this fact of life. In the background are three ninjas.
A ninja is a highly skilled operator, specially trained in the art and science of assassination, espionage, guerilla warfare, covert killing, and combative Martial Arts. In Japanese culture, they are usually trained for dangerous and high-risk stealth clandestine missions. Although their exact origins are still unknown, we do know that they appeared in fourteenth century feudal Japan.