This series is such a treasure trove of quotes; even more so than SHnY, because compared to Kyon, Aizawa has so much more subject to flame.
Nayuki: "Neko. Neko. Neko. Neko."
Yuuichi: "I can't tell which one's the animal."
Yuuichi: "I see, so there are days it doesn't come out."
Sayuri: "What are you talking about?"
Yuuichi: "We're talking about Mai's constipation."
Sayuri: "Hae~"
Mai: "..."