OnCollisionEnter2D not Being Called

Unity Engine
1 
var speed = 7.0;
var explosion : Transform;

function FixedUpdate () {

	rigidbody2D.velocity.x = speed; 
}

function OnCollisoionEnter2D (collision : Collision2D) {

	if(collision.gameObject){
	
		Instantiate(explosion,transform.position,transform.rotation);
		Destroy(gameObject);
	}
}

As far as I can tell there is no reason this shouldn’t work. For the love of God, please do not tell me to check if “IsTrigger” is checked or that I have Rigidbodies attached. I’ve checked everything 100 times.

Please, just give me the most idiot proof solution possible.

Thanks.

2

So…

3

OnCollisoionEnter2D

try

OnCollisionEnter2D

4

So…