A poem on the underground wall

The last train is nearly due
The underground is closing soon
And in the dark deserted station
Restless in anticipation
A man waits in the shadows

His restless eyes leap and scratch
At all that they can touch or catch
And hidden deep within his pocket
Safe within its silent socket
He holds a colored crayon

Now from the tunnel's stony womb
The carriage rides to meet the groom
And opens wide and welcome doors
But he hesitates, then withdraws
Deeper in the shadows

And the train is gone suddenly
On wheels clicking silently
Like a gently tapping litany
And he holds his crayon rosary
Tighter in his hand Now from his pocket quick he flashes
The crayon on the wall he slashes
Deep upon the advertising
A single-worded poem comprised of four letters

And his heart is laughing, screaming, pounding
The poem across the tracks rebounding
Shadowed by the exit light
His legs take their ascending flight
To seek the breast of darkness and be suckled by the night, ooh