Every year, in the month of May, women from the Nahua villages of Guerrero, Mexico, get together to beat the living daylights out of each other in an ancient ritual that they believe will bring water to their land. Oddity Central has more:
The villagers stand in a circle, forming a ring of sorts, waiting for their adversaries to arrive from neighboring communities. The villages of La Esperanza and El Rancho Las Lomas, in particular, have a long standing rivalry – they fight in a field that lies on the border between the two towns. When everyone has arrived, the women begin to seek out opponents, challenging them to fights. The older women, who are seasoned warriors, provoke younger girls to get into the ring and spill some blood.