The lowermybills.com troll faces.

(click images) You, being a Web visitor, have of course seen these faces, and many more, in the last year or so. It used to be stupid dancing people, and these scumbags used to spend $75 million a year to make sure you and everybody else on the Internet saw their ads every goddamn day. I don't know their current ad budget, but their creepy ads are still quite ubiquitous.
Related: the hilariously tactless AccuQuote life insurance ads.