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 HUMP

You 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.

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