If you have
trespassed in
train yards, you may have seen this simple yet bold paper
sign affixed to the side of a
boxcar.
DO NOT HUMPYou and your
dirty mind! They are not trying to prevent you from having
sex in, on, or around the boxcar! The sign means that the
boxcar has
fragile contents and the process of sending it over an
automated hump will damage
the goods inside. Instead they will have to use a switch-yard engine to move it onto the
line that it belongs to.