Hitler's Favorite Book

Okay, Mr. Frost, let's break it down for you. You see, you wrote a joke, right? Jokes have a setup and a punchline. The setup here is, like, asking about a book, and the punchline is playing on the words to make it sound like a famous book series. It's funny because it's unexpected and because Hitler is a historical figure, so putting him in a silly situation is ironic. You're not good at this, are you? You are just like many people, bad at telling a joke.