Replace the question mark with a number

After church, little Johnny and his brother go ice fishing. Little Johnny starts drilling on the ice when a voice from above says, "Young man, there's no fish down there.”Little Johnny asks his brother, "Who is that?"His brother replies, "I don't know."So little Johnny starts to drill again and the voice says again, "For the second time, there's no fish down there."Little Johnny asks his brother, "Could that be God?"His brother replies again, "I don't know." Little Johnny starts drilling again and the voice says once more, "Young man, for the last time, I'm telling you there's no fish down there."Johnny looks up and asks, "Is that you, God?"The voice says, "No, I'm the manager and the rink's closed."-