No appropriate version of 'UnityEngine.Object.Destroy' for the argument list '(System.Type)' was found

I am using the free version of unity for the mac, and I'm currently using the FPS tutorial. My problem is that when I try to use this script:

var explosion : GameObject;

function OnCollisionEnter (collision : Collision) {

var contact : ContactPoint = collision.contacts[0];

var rotation = Quaternion.FromToRotation(Vector3.up, contact.normal);

var instantiatedexplosion : GameObject = Instantiate(explosion, contact.point, rotation);

Destroy(GameObject); }

I get the console message that I used for the title of the question:

No appropriate version of 'UnityEngine.Object.Destroy' for the argument list '(System.Type)' was found

I am still very green in regards to game design (I'm just now learning anything about scripting) so any advice is welcome.

You need a lower-case 'g':

Destroy(gameObject);

With a capital G, the word "GameObject" refers to the type - or the "class" - of objects called GameObject.

With a lowercase g, "gameObject" refers to the gameObject variable which contains a reference to the particular GameObject on which this script is placed.

You can destroy instances of GameObject, but you can't destroy the GameObject class itself!