I remember reading a news item many years ago about a village that sat at the foot of a dormant volcano. I don't remember where it was, but it may have been in South America. Geological evidence proved the mountain had been a volcano, but it had not erupted in recorded history. One morning, the villagers awoke to find black smoke belching from the volcano's crater; they were in a near panic until investigation revealed someone had apparently been dumping old tires in the crater for a long time, & then set them on fire on April Fool's Day.