I learned this in Grade 1 in the early 50's, and like Malcolm never forgot it. It lacks the ahs of his version though.

Woman in a graveyard sat
Ooo ooo ooo ooo ooo ooo ooo ooo
She was very, very fat
Ooo etc. Corpses three came walking in
Ooo etc.
They were very, very thin
Ooo etc
. Corpses to the woman said
Ooo etc.
You'll be like us when your dead
Ooo etc.
Woman to the corpses said
Shrieeeek!