The foul return of folly

The dog returneth to its spew,
And so the sick man has his too –
Unless he has a girl in view,
In which case he'll say something blue,
Like, “How about try something new?”
And she decides that's what she'll do.
So they go off and have a few,
As he tries not to up it screw.
He tries to base defects subdue,
But still the faults come poking through.
So he returns to eat his spew
And there's a sense of déjà-vu.

(Proverbs 26:11)

This was written and submitted for a competition in The Spectator. Alas, it was unsuccessful. The winning entries are, presumably, very much worth reading.