Vibration Effect Question

Hi guys,
so I am using this code on my symbol:
onClipEvent (load) {
height = 150;
width = 500;
cx = this._x;
cy = this._y;
}
onClipEvent (enterFrame) {
this._x = cx+(1+Math.random()*5);
this._y = cy+(1+Math.random()*5);
}

but I would like to apply a tween effect at one point on the timeline, were the mc vibrates but moves out of screen or transitions in scale.

How would I go about this?

Thanks!