Moments from April Fool's Day History

Google's April Fool's Day joke reminds me of a similar joke from many years back, in the dark ages where the Internet was largely text-based. A clever prankster wrote a personality quiz which he promised would allow him to make highly promising romantic matches between those who took the quiz. In fact all matches that he made were random - yet some nonetheless developed into long-term relationships.

(Had he patented that joke as a business model, might he be able to extract licensing fees from eHarmony? Just a question....)