Nutter alert

It might come in a letter,
Darkness falls in a telephone call
I await the unexpected
With one ear to the party wall.
Is it the pricking of the conscience,
Is it the itching of hair shirt,
Is it the dictionary definition
Of a precipice to skirt?
It's the nutter alert.

Though this face is familiar
Something in it has bred contempt
I never asked for your opinion
Or your back-handed compliments.
Oh, but here comes that special nonsense
All the words out in a spurt,
The unhinging of the trolley
As the mouth begins to blurt...
It's the nutter alert

I can see we're in trouble
From that glint in the eye you've got
There's no sense to the story,
Comprehensively lost, the plot.
And how contorted is that logic
You so forcefully exert:
You're a car crash in the making,
Head-on, that's a racing cert.
It's the nutter alert,
This is the nutter alert.