Video on Earthquake Lights in Brazil
Throughout history there has been recorded events right before earthquakes that seem to give warning of upcoming doom. Events like animals behaving strangely are well known; but lesser known are that some reported seeing flashes of light. These lights, earthquake lights, were once regarded as nothing but myths but since the mid-1960s they have been documented and scientifically accepted.
There are a multitude of theories that try to explain the odd phenomenon and no ball lighting-like solution yet. But the promise of answers one day in an unexplained field give geographers an oppurtunity to study something fascinating.