Recently, it was reported that an ancient demon spirit which was imprisoned in a rock around 1100AD, had escaped due to the rock cracking in half. The original article is here.
More information about this particular demon, named Tamamo no Mae, can be found here. Aparrently this particular demon had such an aura of malevolence that geese flying overhead would falter and fall out of the sky if they got too close. I wonder what I might do if I was imprisoned in a rock for 1000 years and finally got loose?