I have a lot of examples
1st
As soon as teacher left the class whole class starts to make noise throw papers or anything switching places even for 1 min. Bad mouthing and so.
2nd
When teacher was in class too then also backbenchers used to make us laugh disturb us all the time means doing all funny stuff
3rd
When teacher used to make boys stand out of the classroom they used peek inside the class doing funny things outside the class and fighting with each other. Once principal saw it and she made them move to other class
There are many more but then this post will become too long.