It was an exciting week to be an electric vehicle fan--if a real up-and-down one. On Monday, Elon Musk welcomed investors to Tesla's Palo Alto headquarters for the company's first Autonomy Day, where he made some serious news: He promised an all-electric, 1-million-car fleet of self-driving Tesla taxis would roam the Earth by next year. The electric carmaker, which loves to do things differently, used the event to tout its new self-driving chip, and double down on its aggressive and heterodox approach to autonomous vehicles. Who cares if the self-driving experts are skeptical? By Thursday, electric vehicle fandom got messier.