One day, a powerful warlord received a message containing a death threat. In response, he hired a dozen bodyguards to protect him from assassins.
Later, one of the warlord’s scouts came rushing into his hall, and relayed reports of an unstoppable master ninja who could assassinate anyone, no matter how well-guarded his target was. Upon hearing this news, the warlord threw up his hands, crying, “If this unstoppable ninja can kill me no matter how well-guarded I am, then these bodyguards do nothing!”, and promptly dismissed them from his service.
The next day, as the warlord meditated alone in his garden, a stumbling drunken peasant smashed a heavy bottle over the warlord’s head, killing him.