Jesse's "stir DOM" fuzzer, which fits in a tweet & a bookmarklet:

    pick = a => a[a.length * Math.random() | 0];
    elts = document.all;
    stir = () => pick(elts).appendChild(pick(elts));
    setInterval(stir, 1);

Fun background information: https://twitter.com/jruderman/status/626381997850632192