How to create a simple text generator

First: What's a generator?

A generator is basically a little fun piece of code that shows a random phrase or image after you click a button.
Here's an example:

Random animals here...

It's a fun thing to put on your website. And pretty simple, too.

<span id="output">Random things here...</span>
<button onclick="generate()">Generate</button>
<script>
function generate(){
  var random_things = [
    "Thing1",
    "Thing2",
    "More things",
  ];
  var generated_thing = Math.floor(Math.random()*random_things.length);
  document.getElementById("output").innerHTML = random_things[generated_thing];
}
</script>

Just look at how simple that is, wow
And you can add HTML inside the entries, here's what that looks like:

Random stuff here

GO WILD!!!!!!!!!