Elon Musk became the butt of more than a few jokes after internet users pointed out Tesla’s robot demo wasn’t all it appeared to be. As it turns out, a video the billionaire posted of Optimus, the company’s much-hyped humanoid robot, was actually being controlled by a human slightly off-screen. And it’s interesting to see robot manufacturers now include assurances in their videos that they’re not doing the same deceptive magic trick as Musk.