You can't expect a 4th grader not to laugh

My friend told me a story she still remembered from 4th grade. Her teacher was reading aloud a book where all throughout it, the main character would stop and say, "It's not my fault!" I guess she slipped and said, "It's not my fart!" Needless to say, all 30 of them cracked up laughing. I am curious as to how the rest of the lesson went after that...