Time-travellers just can't seem to avoid trouble. If they visit a time and place that's close to a famous event, they're almost guaranteed to arrive right before it happens. If they visit the Cretaceous, it's on The Day the Dinosaurs Died. If they visit Europe in 1939, it's at the beginning of World War II. If they visit Pompeii, it's just before Mount Vesuvius erupts. Et cetera. This can also apply to fictional historical events that are very significant in the story. Sometimes, the time-travellers will even