There is no more popular toy in the automotive world than Hot Wheels. Most of us at Donut were introduced to cars through Hot Wheels, and most still collect them to this day. Much like us there are millions of people that are obsessed with Hot Wheels and have incredible collections. How exactly did Mattel create the biggest selling toy in the world? How did it best companies like Matchbox? And how did a failed guitar design save Hot Wheels from losing to the competition?