Do you remember the Pet Rock Phenomenon? More than a million people bought Pet Rocks as holiday gifts in 1975. Gary Dahl, of Los Gatos, California, had the idea while joking with friends about his easy-to-care-for pet, a rock. Pet Rocks were sold with a funny manual that included tips on how to handle an excited rock and how to teach it tricks. By 1976, Gary Dahl was a millionaire and Pet Rocks were the nation’s favorite pet. Let’s make some easy pets who don’t bark or chew the furniture.