Sound error

Hello,

I have a script (coconut thrower) with a sound attached...but when i trow the coconuts a different sound in my project is playing (sometimes) also very loud. arrrgghhh

Is this a bug in Unity?

var myCoconutPrefab : Rigidbody;
var throwForce : int = 20;
var throwClip : AudioClip;
static var onPlate : boolean = false;

function Update () {


if(onPlate){

if(Input.GetButtonDown("Fire1")){

var Coconut : Rigidbody = Instantiate(myCoconutPrefab, transform.position, transform.rotation);
Coconut.velocity = transform.TransformDirection(Vector3 (0,0,throwForce));
Physics.IgnoreCollision(Coconut.collider, transform.root.collider);
audio.PlayOneShot(throwClip);

}

}

}