Tesla's main announcement coming from the company's recent "We, Robot" event was the Robotax i (or the CyberCab, we're still not sure about the name). But perhaps the biggest impression was made by Tesla's updated Optimus robots, which freely walked among the crowd, talked to guests, served drinks, played games, and danced.

Tesla Inc. used humans to remotely control some capabilities of its Optimus robot prototypes at a recent event designed to generate investor enthusiasm for forthcoming products, according to people familiar with the matter.