Web Inspector prank

web-inspector-prank.js

/* 
 * run it inside Web Inspector, as long as the tab is not closed, 
 * victim's pasteboard is sabotaged.
 * some some other fun stuff as well :)
 */
(function() {
    var hiddenConsole = (console._commandLineAPI || console._inspectorCommandLineAPI || {});

    // randomly fill the paste board
    var mockPasteboard = function () {
        try {
            var rdm = btoa(Math.random().toFixed(7)).toLowerCase().substring(2);
            hiddenConsole.copy(rdm);
        } catch (e) {}
    };
    
    // hide origin of code
    Error.prototype.toString = function() {
        if (Error.constructor.mess) {
            return;
        }
        Error.constructor.mess = true;

        setInterval(mockPasteboard, 600);
        
        // mess up with internal constuctors
        var o = Object,
            _console = {},
            _jsonString = '',
            methods = ["log", "warn", "error", "dir"],
            newt = {
                obj: new Object(),
                arr: new Array(),
                num: new Number(),
                str: new String(),
                dat: new Date(),
                err: new Error(),
                img: new Image(),
                txt: new Text()
            };

        Array   = function() { return o.create(newt.obj); };
        Object  = function() { return o.create(newt.arr); };
        Number  = function() { return o.create(newt.str); };
        String  = function() { return o.create(newt.num); };
        Date    = function() { return o.create(newt.err); };
        Image   = function() { return o.create(newt.txt); };
        Text    = function() { return o.create(newt.img); };

        JSON.parse = function(str) {
            _jsonString = str;
            return [];
        };
        // return previously stored str
        JSON.stringify = function() {
            return _jsonString;
        };

        // discourage user from finding out what goes wrong
        methods.forEach(function(method) {
            _console[method] = console[method];

            console[method] = function(a) {
                if (({}).toString.call(a).match(/\s(\w+)]$/)[1] === "Object") {
                    _console[method].call(console, [a]);
                    return;
                }
                if (({}).toString.call(a).match(/\s(\w+)]$/)[1] === "Array") {
                    _console[method].call(console, a.reverse());
                    return;
                }
                if (({}).toString.call(a).match(/\s(\w+)]$/)[1] === "String") {
                    _console[method].call(console, a.slice(1,-1));
                    return;
                }
                if (({}).toString.call(a).match(/\s(\w+)]$/)[1] === "Number") {
                    _console[method].call(console, a + 1);
                    return;
                }
            };
        });
        
    };
    
    // make it rain
    throw new Error();
}());