Didja ever think when the hearse goes by,
That you might be the next to die?
They wrap you up in a big white sheet,
And drop you down about six feet deep,
Where all goes well for about a week,
Until your insides begin to leak.
The worms crawl in, the worms crawl out,
It looks just like green saurkraut.
You spread it on a piece of bread
And that's what you eat when you are dead!

(One version of many.)

There are some I remember only the beginning of, which may jog others memories, like:

Jingle bells, shotgun shells...

Glory, glory, Hallelujah, teacher hit me with a ruler...

Jose, can you see, any bedbugs on me?...

Great green gobs of gooey grimy gopher guts,
Marinated monkey meat, little dirty birdie feet,
Swimmin' in contaminated milk. ...

Finally, some folk songs I know!

Akiba (Shula's custodian)