Looks like the ancient stories of werewolves and people transforming into beasts during a full moon may have some fact to it.

According to a study recently conducted in an Australian hospital they looked at emergency patients with violent, acute disturbances comparable to werewolves. It seems that over a quarter of these violent people were admitted to the hospital during the full moon phase. The patients that were admitted acted like animals and were compared to werewolves. Some of these patients attacked the staff like animals, biting, spitting and scratching,
the patients had to be sedated and physically restrained to protect themselves.

I don’t know if this should be such a shock. Everyone knows that there are more violent crimes and accidents that occur during a full moon. I remember hearing about these studies in the past, I guess the Australians are a little late to the game.

[source]