Lads, I'm trying to set up an OnCollision script so that falling chunks of debris will make a little puff of smoke particles and then be destroyed when touching the ground. I think the script looks pretty good, but I'm missing something. In actuality what is happening is that all debris objects simply disappear when I start the game. Any ideas?:

var explosionPrefab:Transform;

function OnCollisionEnter(collision: Collision) {

if (collision.gameObject.tag == "Terrain")

Instantiate (explosionPrefab,transform.position,transform.rotation);

Destroy (gameObject); }

Thanks,

Stef