Why does this script not do anything?

Unity Engine
1 
#pragma strict

var deadScene : String;

function Start () {

}

function Update () {

}

function OnCollisionEnter(other : Collision) {
    if(other.gameObject.tag == "Player") {
        Application.LoadLevel(deadScene);
    }
}
2

Do you have two colliders, one with at least a rigidbody, on your two objects? If you have a mesh collider it might need the convex option checked.