For the first time in a while, Sensei got genuinely pissed off with the class today - mainly because we kept forgetting to kiai during practice of Tekki Shodan. He made us do 150 pushups as punishment, and actually left the dojo while we did it, which means he must have been properly annoyed. But when he came back he carried on as normal; reading between the lines, I think this was probably a deliberate thing - apply the punishment, then forget about it once that's done.
It was a hard session generally. Something about the heat wave that was sweeping the North East of England at the time, I think. We all felt it - a sort of sleepy malaise brought on by the temperature.