Bye Everybody

I picked Tani up from school today at 3:45 pm to take him to his yoga class. His classmates were sitting on the steps waiting for their parents who would be arriving shortly for the 4 pm pick-up time. As we walked down the steps, Tani shouted "Bye everybody". No one responded to him and the children kept doing whatever they were doing. So Tani said again "bye everybody". Still no response. Finally he said, "This is your last chance. Bye everybody!". All his classmates in unison said "Bye!". The teachers took note of the phrase "this is your last chance" for future reference.