My grandmother would sing me a version of this song when I was very small:

There was an old woman
All skin and bones
Oh such an old woman
Was never known

She went to church one day
To hear the parson preach and pray

And when she got there
Beside the door
There lay a ghost
All dressed in white

She said to the minister
Will I look so when I am...
DEAD!

I realize that this must be quite a corrupted version of the old song. However, it still succeeded in scaring me to death when I was young! I enjoy it very much to this day.