I believe this one originally came from Spiral Dance by Starhawk...
Anger Spell
Go to the waters edge of some pond, river, beach, lake, etc. Find a dark colored stone along the ground. Cupping it in your palms, close your eyes and project your anger into that stone. When you feel as though all your anger is in the stone, throw it is hard as you can into the water. Then say the following:
Anger Be Gone,
Water Bind it,
No one find it,
So mote it be.
(Or something like that)