Sign in a Leipzig elevator: 

    Do not enter the lift backwards, and only when lit up. 

A bus carrying five passengers was hit by a car in
          St. Louis, but by the time police arrived on the scene,
          fourteen pedestrians had boarded the bus and had begun to
          complain of whiplash injuries and back pain.

IDIOTS ON THE ROAD

The stoplight on the corner buzzes when it is safe
to cross the street.  I was crossing with an intellectually
challenged coworker of mine(a blonde), when she asked if I knew
what the buzzer was for.
I explained that it signals blind people when the light is red.
She responded, appalled "What on earth are blind people doing
driving?"