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>
Am I the only one bothered by the fact that they refer to the URL anchor section as a 'hashtag'?