What is something you know that nobody else does?

I’m not gonna tell you. If I did, it’d be something that other people also know, meaning it wouldn’t be a fitting answer. And if it’s not a fitting answer, I won’t answer. But if I don’t answer, that means no one else knows it, making it a suitable answer. And if it’s a suitable answer and I were to answer, then it would cease to be a suitable answer as others would know. So then I wouldn’t answer. And so on.