Passing an office building late one night, a blonde
saw a sign that said, "Press bell for night watchman."
She did so, and after several minutes she heard the
watchman clomping down the stairs.
The uniformed man proceeded to unlock first one
gate, then another, shut down the alarm system,
and finally made his way through the revolving door.
"Well," he snarled at the blonde, "what do you
want?"
"I just wanted to know why you can't ring it for
yourself."