Whistle, Mary, whistle and you shall have a cow

I cannot whistle Mother because I don't know how

Whistle, Mary, whistle and you shall have a sheep

I cannot whistle Mother because I'm fast a-sleep

Whistle Mary, whistle and you shall have a pig

I cannot whistle Mother because I'm not that big

Whistle, Mary, whistle and you shall have a man

Oh, I can whistle Mother, I just found out I can