History: Gary Dahl, the inventor of the Pet Rock, a product that sold for $3.95 and made him a millionaire. The Pet Rock fad lasted about 6 months. 1975 [800 × 600]

http://i.imgur.com/qnRsYxb.png via /r/HistoryPorn https://www.reddit.com/r/HistoryPorn/comments/6q83uc/gary_dahl_the_inventor_of_the_pet_rock_a_product/?utm_source=ifttt