David Letterman didn't cut Donald Trump a lot of slack on his show Wednesday night, first bringing up top Forbes billionaire Carlos Slim Helu, whose family's $73 billion fortune trumps Trump's. Trump estimated his own wealth at $9 billion, but Forbes puts it at $3.2 billion, for whatever that's worth. Then Letterman told him, "you have to stop doing business with your buddies in China," and reminded Trump about how often he says "cockeyed things" on Twitter. Trump agreed: "You say things and you think it's so cute and so smart, and it comes back to haunt you." Of course, that happens in real life, too.