I've read a couple of Dr. Daniel Amen's books on brain health. He's a psychiatrist who also does diagnostic brain scans. He offers lots of tips for dealing with various brain conditions and types. And one of the things he points out is that goofy thoughts pop into our heads all of the time, but we learn to ignore them. "You don't need to believe every stupid thing your brain tells you," he says. But Trump lets it all flow out of his mouth. The man has no filter.