Tuesday -- raised my voice, slightly, once or twice, briefly. But didn't actually shout. Bought ice cream for everybody 'cuz they were all so good!
When was the last time you had a substitute teacher bring you ice cream??? Unless, of course, it was somebody trying to bribe you into good behavior. Which, of course, I was.
[Note to self: re-think concept of "sugar in quantity" vis-a-vis "fourth graders."]