found this on IMDB!

I am the very model of a psychopath tonsorial,
My story is a lesson, yes it’s quite a grim tutorial,
I’m most obsessed with vengeance ‘til it borders on maniacal,
Transforming me from mild soul to something demoniacal;
I'm very well acquainted too with matters anatomical,
I think a severed jugular leads to results quite comical,
I plot revenge against the Judge who jailed me most wrongfully—
And while I wield my razors I spew lyrics out most songfully!

I travelled back to England with a sailor who sings sappily,
You may not know the story, but can guess it won’t...