Let me read

[Emma is reading a book with her headphones on. Joost walks over.]
Joost: “Hi, what are you reading?”
Emma, without looking up: “You can look at the cover.”
Joost, irritated: “Why do you react like this?”
Emma: “I want to read, not talking about reading.”
Joost: “How was I supposed to know?”
Emma thinks: Book, headphones on… it looks so clear to me.