There as a thing my mother used to mention every now and then, I loosely remember it as
They're coming to take me away,
Haha, they're coming to take me away,
Ho ho, hee hee, ha ha,
To the Happy Home with Trees and Flowers
And Chirping Birds, ...
I always figured this was a poem or a limerick from her youth. Except I could swear there was a mention of cows and chickens somewhere. In looking it up, I'm just going to guess she had a LP of Napoleon XIV somewhere.
Actually, that would make some sense if its circa '66. Perhaps in more ways than one.