Fun game! It would've been fun if the whistle made a whistle sound when you tried to use it on anything though... And if you do it too many times, the principal gets mad at you for causing a disturbance, and you get a game over screen. (just an idea)
Also, I found a bug:
If you get the battery before Chef Cheffy appears, it still gives this dialog.
(and what's the frog pencil for??)