Some crazy `new Function` use.

crazyNewFunction.js

var crazy = function () {
    var val = 10;

    return {
        val: function () { return val; },
        changeVal: function () { val = 11; },
        changeGlobal: new Function ('val = 12;')
    };
};

var run = function (obj, fn) {
    fn();
    console.log('Obj val. ' + obj.val());
    console.log('Global val. ' + val);
};

var derp = crazy();
console.log('Derp val before changeVal. ' + derp.val()); // 10.
derp.changeVal();
console.log('Derp val after changeVal. ' + derp.val()); // 11.
derp.changeGlobal();
console.log('Derp val after changeGlobal. ' + derp.val()); // 11.
console.log('Global val after changeGlobal. ' + val); // 12.