Telling my group of twelve year old students that I was "not in the mood" for silliness backfired. The students had come bursting into the classroom, noisy and fractious and chomping on chocolate biscuits. "Well," said one of them, "I'm not in the mood for English!" The rest of the group caught on and before I knew it all five of them had their arms crossed and eyebrows raised - mirroring me. I had to laugh. So did they, after that.