Everybody missed it in that sense. Ie, The Pudding Guy is famous because he's the only one who took advantage of that promo to that degree. That promo was avialable to many other people at the same time (years ago), but no one else thought to take it to that extreme. Most people just bought the amount of pudding they needed for themselves. But it wouldn't have become a famous promo "for all eternity" had The Pudding Guy not taken it to that extreme.