Sinistar
From lurkmore wiki
On February 6th, 2008, the 4chan mods put a sticky on /b/ with a flash picture of html visible through the broken background, and Sinistar followed your mouse. There were also sounds from the game Sinistar, such as, "I hunger!" The message was accompanied by the words, "OH GOD". It has been a meme ever since, although a forced meme.