World's richest person Elon Musk responded after he was spotted vacationing in Greece's Mykonos, amid Twitter's lawsuit against him. Replying to a viral shirtless picture of him, he wrote on Twitter, "Maybe I should take off my shirt more often...(already back in the factory btw)." Musk was joined by Endeavor CEO Ari Emanuel and his wife Sarah Staudinger in Mykonos.