At the event earlier this month, the robots performed a range of activities, including handing out gift bags and drinks and playing rock, paper, scissors with attendees. The robots also danced, including to a remix of the song “What is love (Baby Don’t Hurt Me),” and interacted with guests.

Tesla later confirmed that the robots relied on teleoperation — or remote assistance — repeatedly to make Optimus appear more impressive. About 20 robots were active at all times, according to Tesla’s Optimus lead Milan Kovac, with one incident of a robot falling. The company later put out a less than 90-second video demonstrating an Optimus unit placing batteries in a tray, carrying the roughly 24-pound tray, climbing stairs, and handing out bottled drinks and popcorn to employees.