Gary Dahl, who created the wildly popular '70s trend, the Pet Rock, passed away last week in Oregon at the age of 78. Remember the Smooth Rock inside a cardboard box? With the breathing holes? And instructions on how to care for and feed it? Yep, he created it. He was an advertising executive in California when he came up with the idea that sold for around $4, and sold to around 1.5 million people.

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