Random thoughts:
I saw a chicken cross the road yesterday. It's a beautiful rooster. It managed to cross the road safely. As it crossed the road, I wondered: "Why did the chicken cross the road?" Though a more relevant question would probably be: "Why is there a chicken crossing the road in an HDB estate?"
"Du."
"Du Hast."
"Du Hast Mich."
Sounds like a lesson on German grammar, no? Sia lah, subject-verb agreement!
Thou shalt not bash through a math book and expect to learn anything out of it.