Random scripts I made. Does anyone else know any good ones?

var thingy = document.links; for (var stuff = 0; stuff < thingy.length; stuff++){thingy[stuff].href = "https://www.youtube.com/watch?v=dQw4w9WgXcQ";}//rickroll

var thingy = document.images; for (var stuff = 0; stuff < thingy.length; stuff++){thingy[stuff].src = "https://upload.wikimedia.org/wikipedia/commons/thumb/3/35/Olive_baboon_Ngorongoro.jpg/1024px-Olive_baboon_Ngorongoro.jpg";}//baboon

(Disclaimer: DO NOT put random scripts in your console if you don’t know what they do, they can steal your passwords and stuff).