Let your mind wander where it may, but signs like these were used everyday in large railroad yards to communicate to switchman that certain cars contained fragile freight which were in danger of damage if they were "humped". Humping is a process of switching cars through the yard by pushing them over a hump or hill and allowing gravity to propel then to their desired switching location which in some cases ends in a sudden crash or severe halt. This sign is sure to bring a chuckle when posted. Measures 12" x 8" and is made out of .040 aluminum for inside and outside use. Made in the USA.