Head to school

You head to school like every day but today you are extra excited. You have the stopwatch in your pocket.

The class starts as usual and as usual you are bored in the first 10 minutes itself. So you think of using the stopwatch. You are still a little hesitant as you don’t know if it will work as it is supposed to, but it can only be found by one way. When the teacher is not looking, you take out the stopwatch and press the button. Everything goes silent. Everyone is frozen in the position they were. You stopped yourself from shouting out of excitement but then you realized that no one can hear you. You shout “It worked”. You look all around the room to find someone to mess with.

Who do you find?