The 'Baby on Board' song was written in 1984 by George E. Simpson Jr. as a marketing tie-in for the yellow diamond car-window signs that swept American highways in the mid-1980s. The signs told other drivers to be careful, and the impossibly catchy jingle burned the phrase into pop culture. In 1993, The Simpsons gave it new life when the Be Sharps barbershop quartet performed it in 'Homer's Barbershop Quartet,' winning a Grammy in the episode. Decades later the chorus still surfaces in parenting memes, driving videos and reaction edits.