Some said players had to open a scroll of town portal, some said that players had to poke them (to initiate dialogue) hundreds of times, there were multiple variations on the theme.
Specifically, that there was a super-secret level players could only reach by doing something to the harmless cows in the town of Tristram. Once upon a time, a popular, yet entirely untrue rumor popped up concerning Blizzard Entertainment's seminal hack-n-slash RPG, Diablo.