爆炸案？!

This morning assembly had happen something scare event.A boy put a powerful firecracker in the toilet . Unfortunately ,got a Form 3 boy was using toilet.The big sound had successfully made him crying in front of the whole school student.At the same time ,I was standing behind that toilet.Of course, I don't cry la...I just scared because I think the "booms" sound is created by Huey Tyne .Today , she was in charge on sound system . All of us thought the speaker is broken.