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In 1975, Gary Dahl, while sitting in a bar listening to people complain about their pets, he joked that he had the perfect pet - a rock. Dahl was in marketing and decided to make is joke a reality. He invented and then sold rocks to people as pets, complete with instructions which included: "To be sure, training a rock to come when it's called requires extraordinary patience."

Dahl sold 1.5 million Pet Rocks for $4 each, and became a millionaire. Only in America.....