What Happens When Cesium (or Caesium) Contacts Water?

How violent is the reaction between Cesium (or Caesium) and water? Why is it so violent? Because Cesium has large atoms, so it requires less energy for the water to remove an electron from the Cesium atom, which allow more energy to be used to generate heat from the reaction. Please vote on this at YouTube if you learned something: http://www.youtube.com/watch?v=zCARhVfeX5U