Callee

var ninja = {
    yell: function (n) {
        console.log(n);
        return n > 0 ? ninja.yell(n - 1) + 'a' : 'Hiy';
    }
}

var tyko = {
    yell: ninja.yell
};

var jim = {
    yell: tyko.yell
};

ninja.yell = function(n){
    console.log(n)
    return 'hiyaaaaaa!!!'
};
console.log(jim.yell(5));