Your teacher is a liar.
“What a horrible way to start a book,” you say. “What a baseless accusation!”
How can I possibly know this about your teacher? I’ve never even met your teacher.
I don’t need to have met your teacher to know that they are lying. I can prove it. See, answer me this: when your teacher taught you about the history of the world, did they talk about ducks?
No? They didn’t?
That is how I know your teacher is a liar.
Luckily I am there to tell you the true history of the world, which you absolutely, definitely cannot tell without talking about ducks.