Adding Force to a Rigidbody through OnTriggerEnter

This is compliling correctly. The object this is attached to (a boomerang) will go through the object with this script. The object it is hitting is not set to a trigger, and has a rigidbody. I am getting no console errors either. I’ve also tried this with enemy.gameobject.rigidbody.AddForce and so on… No luck. Thanks in advance!

using UnityEngine;
using System.Collections;

public class Enemy : MonoBehaviour {

	void OnTriggerEnter (Collider enemy){
		if (enemy.tag == "enemy") {
			enemy.rigidbody.AddForce (8000, 2250, 0);
			Destroy (enemy.gameObject, 2f);

I tried it myself and got some results. Check your tag is set to ‘enemy’ instead of ‘Enemy’ incase there was a caps.

EDIT:Read the comment below about rigid bodies