You can’t go to sleep yet. You have to remember that thing that happened all those years ago. Remember how embarrassing it was for you. And with all those people watching. It’s important that you remember, so you don’t embarrass yourself again.
You tell yourself that it’s all in your head. That nobody actually remembers those moments. But… you remember it. And you can’t be the only one, right? That just wouldn’t make sense, statistically. If even one other person remembers the embarrassing thing you did, then there would likely be one more, right? And another, and another. So the only logical, rational, sane conclusion is that everyone remembers that embarrassing thing you did all those years ago. And they think about it at least as much as you do. They probably even wrote about it on their blog.