"Noah and his ark (thoroughly offensive to ...)" joke

A long time ago in a country far, far away...
Noah built his ark according to the instructions received, loaded it up with every animal under the sun, in pairs, and set off.
And it rained.
And it rained some more.
etc
etc
So, having sailed about for a couple of weeks, Noah has a problem. All these animals eat. And when they eat they prodeuce:
SHIT
Lots of shit.
More shit in one area than has ever been seen.
And every kind of shit.
Noah is in a quandry. So he gets all his sons together and tells them to collect all the shit they can and get it up on deck. Noah digs in too and they set about offloading a half a zillion tonnes of turd overboard.
And that would be the very unamusing end to our story if it were not for the actions of a chap we shall call Chris.
Who set sail, and in the year 1492 discovered it.