You walk to the office and dial the number for Pizza Hut, which you have memorized because you order pizza every Saturday night. You become worried because after several rings, no one answers. Your thoughts become filled with questions. Could there have been an emergency and everyone in the city is hiding or in shelters? Maybe a giant asteroid is going to hit the earth and people have more important things to do than go to school or answer the Pizza Hut phone. Maybe someone famous was in town and everyone went to see her?

You continue these thoughts for a couple of minutes. You consider hanging up because you just had pizza last night. Finally, you realize why no one is answering the phone and why no one is at school: it’s Sunday morning!