"God asks Noah to build a New Ark" joke

One day God calls down to Noah and says, "Noah my old friend, I want you to make me a new Ark."
Noah replies, "No problem God, me old supreme being, anything you want after all you're the boss!"
But God interrupts, "Ah but there's a catch this time Noah, I want not just a couple of decks, I want 20 decks one on top of the other."
"20 DECKS!" screams Noah, "Well, ok, whatever you say, should I fill it up with all the animals just like last time?"
"Yep, that's right, well... sort of right. This time I just want you to fill it up with fish." God answers.
"Fish?" queries Noah.
"Yep, fish. Well, I'll make it more specific Noah, I want Carp, wall to wall, floor to ceiling, Carp!"
Noah looks to the skies, "OK, let me get this right. You want a new Ark?"
"Check."
"With 20 decks, one on top of the other?"
"Check."
"And you want it full of Carp?"
"Check"
"Just one thing, why?" asked Noah.
"No special reason." says God, "I just always fancied a Multi-Story Carp Ark!"