I pranked my class with cardboard inside chocolate wrapper๐ ๐ฐ(Gone wrong)

I was in class 9th and that day I brought a chocolate wrapper in which I put down cardboard pieces instead of chocolate bar.... I packed that very smartly just like a brand new chocolate.....๐ Me and my friends planned to put that on front bench in lunch and we followed our plan too.... Many boys and girls were talking about that chocolate and thinking whose chocolate that was...Many boys also came to take but they just passed out from there by looking at the same....Some were also planning to take that chocolate....Me and my friends were silently looking at this atmosphere and we were really enjoying that.๐๐...While this craziness was going ....suddenly Our maths teacher came just before the bell rang out.๐ฒ๐จ. me and my friends were stunned to see him...Sir took that chocolate and asked "whose chocolate is this"....We were silently watching and praying that he shouldn't open that wrapper..๐ญ๐ฑ..Then he called peon aunty to take that chocolate and to give that to a...