We don't know. That's the point. Kyon specifically mentions he doesn't know what his expression was, so KyoAni went with not showing his face.
However, while Koizumi was most likely joking from the start, his laughing was a result of the response he got.
__________________
WARNING: Kogetsu Shirogane cannot be held accountable for any actions taken by someone else. Potential side effects of communicating with this user include headaches, mild confusion, insanity, delirium, and jumping into fires. Do not expose this user to sunlight or water or feed this user after midnight. ... so you think you're a king now...
|