The Definition of Fly

We were in the locker room after Max and JayJay's swimming lesson.  The boys were changing out of their swimming trunks back into their street clothes.  JayJay pulled up his pants and buttoned them.  Then he sat down to put on his socks.

"You need to zip up your fly, JayJay," I said while helping Max put on his shirt.

"Oh, yeah," said JayJay and zipped his pants.

Max sat down to put on his socks too.

JayJay said, "Max, you need to zip up your fly."

Max ignored him.

"You need to zip up your fly, Max," JayJay repeated, despite the fact that Max's pants did not actually have a fly.

Max still ignored JayJay.

"You don't know what a fly is.  Do you know what a fly is, Max?" JayJay said.

"Yes, I do," said Max.

"No, you don't," said JayJay.

"Yes, I do," Max insisted.

"What is it?" JayJay asked.

"It's a bug that lands on your zipper," said Max.