Logic Puzzle #55 - Brown Eyes and Red Eyes
There is an island of monks where everyone has either brown eyes or red eyes. Monks who have red eyes are cursed, and are supposed to leave the next morning. However, no one ever talks about what color eyes they have, because the monks have a vow of silence. Thus, no one knows their own eye color; they can only see the eye colors of other people, and not mention them.
Every day, the monks enjoy a silent brunch together at a round table. One day, a tourist visits the island monastery, and, unaware that he's not supposed to talk about eyes, says "At least one of you has red eyes." Having acquired this new information, something dramatic happens among the monks. What happens?