Imagine any time you've felt a worry or fear of something, but imagine it's being said by another person. They will not shut up. You have to listen to them. You know they're wrong, logically, but they're very convincing and keep going on. I mean, they're not wrong. While unlikely, the car next to you COULD suddenly swerve and hit you. It's not impossible. They're getting louder. They will not shut up. They get louder again. They will still not shut up. They drown out every sound. You can't hear anything else but how this terrible bad thing is going to happen.