Henry: Ok I'm ready!
Henry: John were are you? Come find me.
John: I can't.
Henry: Why Not? I'm in the office. Come find me.
John: I'm busy (playing legos).
Henry: Ok. Come find me when you are ready.
Henry: (3 minutes have passed) Where are you? I'm in the office. Come find me.
John: Ok. I'm ready.
10 seconds later ... pandemonium. You guessed it - schools out again today.