Simple Random Selector

For a starting point

HTML

<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css">
<p>Next thing: <span id="selected_thing"></span></p>
<ul id="universe">
</ul>
<button type="button" class="btn btn-danger" id="new_thing">Select Again</button>
<hr>

JavaScript

var mylist = ["thing1", "thing2", "thing3"];

for (var i = 0; i < mylist.length; i++){
    $("#universe").append("<li>"+mylist[i]+"</li>");
}

$("#new_thing").click(function(){
    var selected_index = Math.floor(Math.random()*mylist.length);
    $("#selected_thing").html(mylist[selected_index]);    
});