Thinking about what you are thinking about

Profoundly deep thoughts from a 7-yr old: (context she is reading a book about magic, and the next chapter is about "reading minds". I tell her she could always ask me what I'm thinking, and I'll tell her). Quinn then tells me that whatever I'd say next, I'd be lying.... because I'd be thinking about what I was thinking about, so any response other than "I'm thinking about what I was thinking about" is untrue... and because of that I couldn't actually tell her what I was thinking about  originally, therefore my original statement , about just ask me , was also a lie.

*face palm*, oye vay.