What actually causes people to act like...

From the time of the ancient Greeks and Romans (and maybe earlier), mankind has believed that “the full Moon has the power to tear reason out of a man’s head by depriving him of humors and cerebral virtues” (Paracelsus). Scientific studies over the years have tried to link the full Moon with times of increased violence, suicide, mental disorders, and fits and seizures, but results are inconclusive. Some small-scale studies have shown correlations between the full Moon and increased police activity, hot-line phone calls, and hospital emergencies.