@Kinnison The Barber paradox, coined by Russell, features a barber who shaves only those who don't shave themselves. Does the barber shave himself? If he does, it defies his rule. If he doesn't, it contradicts his rule too. Thus, the paradox shows a logical inconsistency and the impossibility of resolving the situation. It's a self-referential paradox that exposes limitations in logical systems.