You Need a Whistle

The procedure for letting the kids know that recess is over is  for one of the teachers on duty to blow a whistle.  Everybody stops playing and lines up with their teacher to come back inside.

So today, while walking out to recess, a kid noticed something about his teacher and had a question.......


Kid:  How are you going to know when recess is over if you don't have a whistle?

Teacher:  Well, I have a watch.    (She puts her hand on her wristwatch) 

Kid:  Yeah, but a watch doesn't make noise like a whistle.


I need a weekend to think about this.