Explosion Jumpscare Script ?

Yes, there a two problems in your question :

• you didn't format your code

• you didn't say anything about what the problem was i.e. where it was not giving the desired result

Please read / watch :

• http://answers.unity3d.com/page/newuser.html

• http://video.unity3d.com/video/7720450/tutorials-using-unity-answers

So at a complete guess , there are three problems with your code :

• you are trying to use a command outside of a function Aftermath = GetComponent ("Particle");

• you have put a semicolon after function OnTriggerEnter (collision : Collider)

• you have assigned the value to SingleUse incorrectly SingleUse == 1;

Functions look like this :

 function Start () 
 { 
     Aftermath = GetComponent ("Particle");
     Aftermath.enabled = false; 
 }
 
 function OnTriggerEnter (collision : Collider)
 {
     // ....
     SingleUse = 1;
 }