I was listening to Spotify just now, and an ad popped up at the bottom saying "This content requires Java Update 13.6 / Would you like to update it now? [Install] [Continue]" Out of curiosity (knowing full well it was a hoax, as the current version of Java is version 8 update 45, not "13.6"), I clicked on it. I was taken to a site presenting a bogus EULA for a "player" it wanted me to download. (Link)
I found this advertisement personally unacceptable because I'm a computer service technician, and this is how people end up with junk and/or malware on their computers. This is not advertising, this is malicious content distribution.