At the playground

Not exactly an Adi tale - was looking at kids playing in the lawn the other day while kiddo was practicing to be a tricycle champ. One of the moms came out and announced that her kids have to come inside at 6 and she went back home(her house overlooks the lawn they were playing at). Kids started having a discussion at this point and it went like this:
Girl 1 (confused): When do you think it will be 6?
Girl 2 (yes, she had an answer to it): I think its around midnight.
Boy 1(the one who knew his numbers): No. Its somewhere near 5.
Boy 2(smarty pants): Know what? Lets play in the other lawn. Your mom cant see you then!
And they all ran away happily to the other side.