How to get random GUI to appear, on entering a trigger. (PIC INCLUDED)

So i’m trying to make random gui’s appear when the player enters a trigger. I’m not sure if random gui’s are the right things to use for this. If anyones played Mount and Blade i’m trying to make it like that were theres a description of some stuff thats happening overlayed on a picture, and then several options that you can choose from to respond to what is happening.

I know this script doesn’t work I just made it to be a rough idea of what i’m trying to do.

`using UnityEngine;
using System.Collections;

public class DetectGridGrassland : MonoBehaviour {

void OnTriggerEnter(Collider other)
{
	Debug.Log("Player entered the Grass Land");
	float rnd = Random.value;

	if ( rnd < 0.05 )
	{	
		GUI.Box (Rect (10,10,100,90), "Attacked by bandits");
	}

	else if ( rnd < 0.15 )
	{
		GUI.Box (Rect (10,10,100,90), "Attacked by wolves");
	}
	else 
	{
		GUI.Box (Rect (10,10,100,90), "Nothing happens");

	}
	}
}

}`

Here is what i’m trying to achieve.

Try something like that actually in C#:

public int randNum = 0;

void Start(){
randNum = Random.Range(0,5);
}

void OnGUI(){
if (randNum <= 3){
GUI.Button(new Rect(10, 10, 125, 25), "Attacked by bandits");
}
else if(randNum == 3){
GUI.Button(new Rect(10, 10+20, 125, 25), "Attacked by wolves");
}
else{
GUI.Button(new Rect(10, 10+30, 125, 25), "Nothing to do!");
}
}

You can also do it with an array, it’s a cleaner code and better to control.