I'm a Canadian and I learned this song from my mom - she sang it to me as a child. Now I sing it to my own son, and I thought I'd try to look up the lyrics - I had no idea so many people knew it!
Well mine are the same in the beginning but the last half is different:


Ohhhh, I live up in a Nuthouse. My mind is in a rut
My keeper thinks I'm crazy But I'm sure she's off her nut
I'm just the same as you are And I can prove it too
For when I sing this lullaby You'll know I'm not Coo Coo

I was born one night one morning when the whistle went boom boom
I can bake a steak and drink a cake When mudpies are in bloom
Six and six are nine And rice comes from a mine
And Old Black Joe was an Eskimo On his way to Caroline

We get honey from the trees
And all the horses climb the bees
And all the horses climb the bees on the way to Mandalay
Hay heh!