Something like that web site happened to our secretary ages ago. The boss, standing behind her, had asked her to look something up, she innocently clicked on one “search result”, and porn ads popped up. Whenever she closed a window, more opened. All while the CEO was looking over her shoulder. I was called, and killed Netscape, and had to explain that this was not the secretaries fault. I entered the same search, and showed them both the amazingly genuine looking result, and the CEO said that this could have happened to him, too. And he was thankful to learn how to kill the browser in such a case.