Just paste this before your body closes: <script> // Uncomment the next line if you want the prank to happen only when the url hashtag is #april // if (document.location.hash.indexOf('april') > -1) document.body.style.webkitTransform = document.body.style.MozTransform = 'rotate(' + [45, 90, 135, 180, 225, 270, 315][Math.floor(Math.random() * 7)] + 'deg)'; </script>