Solution for #23

These two men, along with several others, were shipwrecked on a desert island and had run out of food. The men agreed that they needed to eat their arms to survive, but that it if one person had to lose his arm to save them, they should all lose their arms. The men were rescued before the last man's arm was eaten; this man ran away before he could be caught and forced to give up his arm. However, he bumped into one of the other survivors in the subway one day, who killed him for not living up to his end of the bargain.