Tesla CEO Elon Musk appeared at US Presidential candidate Donald Trump's rally in Butler, Pennsylvania wearing a black-on-black cap bearing the "Make America Great Again" (MAGA) slogan of Trump's campaign. "I'm not just MAGA, I'm Dark MAGA," Musk joked. Dark MAGA is a crypto meme-coin inspired by online trends and its valuation soared right around the time that Musk spoke.