Student: Will our final exam be the same as the other ICC class?
Me: What other ICC class? I didn't know there was one.
Student: Yeah, they meet next door at this time.
Me: Nobody told me about it. So no, the exam won't be the same. In fact, I doubt the teacher in that class is even using the same textbook.
Student: Actually, he wrote this textbook (holds up the textbook I chose for the class after looking through every ICC textbook I could find).
Me: 不会吧! I can't believe nobody told me about this!
What can we learn from this incident?