 Another such sine qua non requirement is what one may call the “law of likelihood”, or “plausibility”. Aristotle strongly insists on this: all events must offer the appearance of causality, and follow not one after the other, but from each other (10, 1452a20–21). Faced with an event that is totally unexpected in being disconnected from any normal causal sequence would just be incredible, and, in worst cases, hearers would laugh instead of feeling pity or fear. Of course, unexpectedness can be an efficient tool for evoking strong reactions. For example, 