Certain
You take a stone to the forehead of a turkey. It is certain that you will damage it.
Try hitting a sponge on a turkey's forehead. Not certain. Now a stone. Certain.
かく
たし
None
You're killing this turkey, and you need to make sure he's dead for certain. The reason you need to make sure this turkey is dead is because of the cock (かく) in your life. Male chickens get really jealous when turkeys are around.
As you smash the stone into the turkey's forehead, yell out "This is for you, my cock! THIS IS FOR YOU!" Your cock lover watches from the shadows.