<human>:  Why did Elon Musk leave PayPal?
<bot>: Elon Musk left PayPal to start Tesla Motors. In the beginning, Tesla Motors was a small startup company that had a goal to make electric cars. It wasn't until Tesla Motors began selling its first electric car, the Roadster, that it really started to take off. Since then, Tesla Motors has grown to become the largest car manufacturer in the world.