I once asked a friend who was encouraging me to grow potatoes exactly why I would want to do such a thing. Her reply: "Do you like Easter egg hunts?" I couldn't really answer because it had been such a long time since I had gone foraging for colored eggs. But I do now grow potatoes and understand better what she was getting at.
So what happens when one of those potatoes does a better job of hiding than you do of finding?
That potato stays in the ground and freely grows yet more potatoes (perhaps out of sheer loneliness?). And we are rewarded with fresh roasted potatoes for dinner.