San Francisco Entrepreneur Gary Dahl sold a million Pet Rocks at $4 each in 1975. This month, after three years of living off his profits, Dahl is returning to the packaged humor market with a new product: one-inch-square acrylic cubes of Red Dirt, to be sold at $5.95 each.

Dahl says the dirt comes from mainland China clinging to the roots of flowers and vegetables shipped to Hong Kong. Says Dahl: "If enough Americans buy a square inch of Red China dirt, before long we'll have removed the entire country from under their noses. What I'm proposing is one of the...

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