MonoBehaviour.OnTriggerEnter(Collider)

Description

OnTriggerEnter is called when the Collider other enters the trigger.

This message is sent to the trigger collider and the rigidbody (or the collider if there is no rigidbody) that touches the trigger. Notes: Trigger events are only sent if one of the colliders also has a rigidbody attached. Trigger events will be sent to disabled MonoBehaviours, to allow enabling Behaviours in response to collisions.

	// Destroy everything that enters the trigger

	function OnTriggerEnter (other : Collider) {
		Destroy(other.gameObject);
	}

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void OnTriggerEnter(Collider other) {
        Destroy(other.gameObject);
    }
}

OnTriggerEnter can be a co-routine, simply use the yield statement in the function.