This happened in my primary 4 you know how we all answer yes and no when the teacher ask something.
well someone kept spoiling the air and we were all angry the teacher walked out annoyed and said we should rot in our smell.
When she came back she asked the class "Have you finished" only one boy shouted "YES"
we all got up and gave him a knock.
The poor boy he kept shouting it was not me he just just taught the whole class will answer