People may like to shop for cars online, but they still want to test drive them in real life before buying. So when the online car sales company Shift launched, it created a system its founders were sure would win customers over: They hired “car enthusiasts” -- guys just really passionate about cars -- to drive a car to a customer so they could test drive it together. The car enthusiasts were a hit; people loved them, and praised them online. But Shift wasn’t celebrating: As it turns out, the car enthusiast program was so expensive to run that the company wasn’t actually making money. And that meant Shift needed to do something that felt crazy: blow up the feature everyone loved.

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