There is a link in the top right corner of the screen (/~/) that, when clicked, introduces a glitch into the page. Each click adds another glitch.

Once inside a page, adding ~ to the end of the URL in your browser will reload that same page in a glitched state.

If the page is left inactive, it will begin to glitch on its own in a different, more active way. You can also trigger the same effect manually by holding the Shift key and pressing G on your keyboard.