They bring their friends and their friends friends too,
And they make a terrible mess of you.

The version we knew started:

Have you ever thought as the hearse goes by
That some day it will be you and I
We all must follow the same old track
With never a thought of turning back
Old Mrs ___? she died last week
Now the worms are eating her damask cheek
And every time she wobbles her chin
A worm crawls out and a worm crawls in.

I can't remember what comes next but there are other threads on this - at the top of this page, try the one called The worms crawl in.
Robyn