Baby On Boar refers to a five-inch sign intended to be placed in the back window of an automobile to deter tailgating. First marketed in September 1984 by Safety 1st Corporation, the sign became a ubiquitous fad, flourishing in 1985. Its use in the US rapidly declined by 1986 as parody imitations with lines like "Baby I'm Bored", "Pit Bull on Board", and "Mother-In-Law in Trunk" became popular, although its popularity continues in the United Kingdom (along with other versions such as "Princess on Board" and "Little Person on Board") and in Japan (usually saying Baby In Car) well into the 21st century, with the sign written in either English or Japanese script. The parent company diversified into infant and child care products.