Neither Female or Blond

I recieved this in an E-mail this morning and couldn't resist passing it on here....too funny

These contractors are installing the steel pillars in concrete to stop vehicles from parking on the pavement outside a sports bar downtown.
They are now in the process of cleaning up at the end of the day and anxious to go home.
How long do you think it will be before they realize where they parked? Can we say DUMB?