If they ever ask you where I went
Conjure up a steam tunnel incident
A fable of my failure to repent
An admonition to the impudent
That way I’ll always be the instrument
Of your impassioned self-aggrandisement
This is a little fragment that keeps kicking around my head. I think there are 16-20 lines before and 2-6 lines after this part, but I don't know what they are.