private void OnCollisionEnter(Collision collision)
 {
     if (collision.gameObject.name == "ColpoCannone")
     {
         gm.RimuoviAlienoTrapper(this.gameObject);
         gm.AccendiImageKill();
         Destroy(this.gameObject, 0);
     }
 }
 private void OnCollisionEnter(Collision collision)
 {
     if (collision.gameObject.name == nomeMacchina)
     {
         macchina.GetComponent <NewCarController>().life -= 15;
         Debug.Log("Danno");
         visto = false;
     }
     if (collision.gameObject.name == "ColpoCannone")
     {
         GetComponent <Rigidbody>().AddForce(new Vector3(10, 20, 10) * 10, ForceMode.Impulse);
         gm.AccendiImageKill();
         gm.RimuoviAlieno(this.gameObject);
         Destroy(this.gameObject, 2);
     }
 }