Plumbum

If you stick your finger up your bum
And pull out a plumb
It is bound to be rotten.
Unless of course
You just put a fresh one in there
To give elocution lessons to the sphincter.
Think about that
When your plumber shows his wise crack
And how the pipes of houses
Used to be sealed against rust
With the element lead,
Which caused those drinking
All eight glasses a day
To think about what their arse might say.