The event, titled “We, Robot,” drew inspiration from the 2004 film “I, Robot,” starring Will Smith, which portrays a world where advanced robots turn on humans. The similarities between the event and the movie extend beyond the name. The autonomous vehicles and Optimus bore a striking resemblance to the technology depicted in the film.

Elon Musk sparks rumors with the potential $250 Tesla Pi Phone, but no official announcement yet. Speculative features include solar charging.

You could fall asleep and wake up at your destination,” said Mr. Musk, Tesla’s C.E.O., but some experts are skeptical that such cars will be ferrying passengers soon.