A Project Wonderful (I think?) ad on Tegaki; I don't recall specifically what said, but it had the avatar silhouettes against a blue sunburst background and somehow the flavor text made me think it was some kind of MMO/RP site. I would have never thought I would end up staying on a site like this, in fact in my Fresh Meat thread I recall asking if there was anything else to do besides dress up pixel dolls haha. But only good has come of it, so I'm glad that I saw that ad. :)