For kids 9-13 (my 5 year old grandchild doesn't get to hear this from Nana just yet)

You better watch out when the ghosts come by,
Or you will surely di-i -ie.
They'll wrap you in a bloody sheet,
And bury ya about 6 ft. deep.

And all goes well for 'bout a week,
And then your casket begins to leak,
The worms crawl in, the worms crawl out,
The worms play poker on your scalp

Your stomach turns a slimy green
And pus pours out like pure whipped cream
You soak it up with a piece of bread
And that's what you eat when you are dead.