It's one of the earlier rules
"Please choose people from history, or movie/TV/literary/video game chars/etc. characters that, if you were to throw a dart out the window, at least 50% of people hit would know this character."
It was dropped because, to put it as delicately as possible, it was bollocks.
Besides which I chucked a hundred darts out of the upstairs window and didn't hit anyone other than a cat