Manhole

You walk down a road
Think nothing much
Like automatic mode
And your attention such
Look down where you walk
Stop right there, makes you balk
And recoil in terror
What's this peculiar error?
It's the simplest thing
Yet i could make you swing
A manholes open maw
Stares at you menacingly
Slightly back your feet must draw
Almost embarrassingly
Were you to fall
Like a rag made doll
Where would you go?
I'd never know.