Answer by schwertfisch

I am very new to Javascript but on similar occasions I use something like:

function OnTriggerEnter (col: Collider) 
{
    if (col.gameObject.tag == "wall"){
    Instantiate(soundEffect, transform.position, transform.rotation); //this will make a sound effect on collision
    Destroy(gameObject); //this will destroy the object the script is attached to
}