http://unity3d.com/support/documentation/ScriptReference/GameObject.SendMessage.html
// Calls the function ApplyDamage with a value of 5 gameObject.SendMessage ("ApplyDamage", 5.0); // Every script attached to the game object // that has an ApplyDamage function will be called. function ApplyDamage (damage : float) { print (damage); } //このように自分の中で関数を呼ぶなら、SendMessageを呼ばずに //直接呼べばいいと思うのだが、こういう使い方はよく見かける