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We may look down on all the primitive peoples who are confused by lightning and think thunder is the voice of the gods, but the truth is to this very day there are natural phenomena that our scientists still don't being to understand. We're talking about events that are witnessed by thousands, photographed, well-documented and yet are utterly baffling. Such as... What would you do if you were walking along a tropical river at night and it suddenly began burping up egg-sized balls of red light? It happens every year in October along the Mekong river (the same one featured in classic Vietnam movies like Rambo II and the flashbacks from Rambo III ).