Peppy, rhythmic and exceptionally memorable, “Gimme a Break” has been used to entice consumers to buy and share a Kit Kat almost continuously since the brand introduced it in the U.S. 37 years ago, with versions sung by a parade of music stars from Carrie Underwood to Chance the Rapper. The song is so sticky that a study conducted by a University of Cincinnati marketing professor found it to be one of the top 10 “earworms”—those nefariously melodic bits that lodge themselves in your head and you just can’t shake.