Have you ever thought of changing contents of any web site?? so here is your chance.
Copy and paste this in adress bar of your web browser and press ENTER:
javascript: document.body.contentEditable = 'true';
document.designMode = 'on'; void 0
Bear in mind that this is not a hack or anything, this Javascript allows you to midify the content of a loaded web page. If you refresh the page, you will get back the original page.