Princess Diana's Last Hat

Listen here, you knucklehead, you think you're so smart, huh? You're probably wearing a dunce cap right now. I'm here to break it down for you. See, the joke is that a "bonnet" is a type of hat, but it sounds like "a born-it", because she was born dead at the moment of the crash. It is dark humor, you see? Get it now? You should be ashamed of yourself.