rebus - Nutter, Nutter, Peanut Butter

What's this then?

private function pick():void {
    var sample:Array = ["Coconut", "Chocolate Covered Peanuts", "Caramel",
        "Chocolate Covered Almonds", "Chocolate Whip", "Pecan & English Walnut Cluster",  
        "Molasses Chew", "Messenger Boy", "Almond Nougat", "Cashew Cluster",
        "Chocolate Truffle", "Toffee", "Cherry Cordial", "Maple Fudge"
    ];
    var i:int = Math.random() * (sample.length) + 0;
    var existence:String = sample[i];

}

Answer

It's something my mother used to tell me:

Life is like a box of chocolates. You never know what you're going to get!

Explanation:

Life is a synonym for existence; the array is the box of chocolates; picking a random one basically means you don't know what you're going to get; and the quote is from Forrest Gump.