"Finn had a good day," were his teacher's exact words.
Now when I asked Finn about his day, he happened to mention, "I hit some kid." Nice. Why? "He was making a lot of noise and wouldn't be quiet." So we had a discussion that we don't hit people (as if we'd apparently never had conversations before that we don't hit people). He did get a "time out" as a result: he had to clean up the toy area. Much more to my liking than sitting facing the wall.
And then we had a further discussion about repercussions at home if he is hitting people at school. Don't want you to think I'm lax on discipline or anything.