#181 chars - 1 (explanation) - 10 (no jQuery) = 170 points

    javascript:i=setInterval(function(){for(var a=document;0!==a.childNodes.length;)a=a.childNodes[a.childNodes.length-1];a!==document?a.parentNode.removeChild(a):clearInterval(i)},50);

I guess I could make less points by using jQuery and not traversing properties, but oh well.

**Ungolfed:**

    var intervalHandle = setInterval(function() {
        var lastElement = document;
        //get last element
        while (lastElement.childNodes.length !== 0) {
            lastElement = lastElement.childNodes[lastElement.childNodes.length - 1];
        }

        if(lastElement !== document) {
            lastElement.parentNode.removeChild(lastElement);
        } else {
            clearInterval(intervalHandle);
        }
    }, 50);

Basically this finds the latest DOM element on the page and removes it. Then keeps doing that for every 50 milliseconds, which I found to be a kind-of-average nice speed to see a page getting ripped from the ground up. It's therapeutic, I swear it.

Disclaimer: I had made this some time ago and decided to share it, since it seems appropriate here. The source is at [my GitHub repository][1].


  [1]: https://github.com/AlphaGit/random-javascript/blob/master/destroy-me/destroyme.js