Laughter in class

This story happened during my school days. We were all studying the pendidikan moral subject. There was a part where the teacher made some jokes regarding people's behaviour in public and how they did not realize that other people were watching them. Some of the examples were very funny and got the whole class laughing wildly. After a while, laughter faded as we were catching our breath. One girl did not stop laughing and we turned around, only to see an empty chair at the back, rocking one side to another.

Everyone freaked out and ran out of the classroom as fast as we could. Even the teacher did not wait for us. After a while, some of the guys went to look but things were normal again. Many have tried to move out of the class, but the school did not accept such excuse.