Didn't know unicorns were involved, and I don't remember where I got these lyrics :-

Brother Noah, Brother Noah,
May I come into the ark of the Lord.
For it's growing very dark and it's raining very hard.
Hallelue. Hallelue. Hallelue-eu-eu-eu-ya.

No you can't sir. No you can't sir.
You can't come into the ark of the Lord.
For you have committed sin, so you ain't a-coming in.
Hallelue. Hallelue. Hallelue-eu-eu-eu-ya.

Very well sir, Very well sir.
You can go to the devil with your darned old scow.
'Cos it ain't going to rain very hard, no how.
Hallelue. Hallelue. Hallelue-eu-eu-eu-ya.

That's a lie sir. That's a lie sir.
You can darn soon tell that it ain't no sell
For it's sprinkling now, but it's going to rain like hell
Hallelue. Hallelue. Hallelue-eu-eu-eu-ya.