1974 commercial for KitKat!
A Kit Kat is a confection which was first created by Rowntree’s of York, England and now produced worldwide by Nestlé, which acquired Rowntree in 1988, except in the United States where it is made under licence by The Hershey Company. Each bar consists of fingers composed of three layers of crème-filled wafer, covered in an outer layer of chocolate. Each finger can be snapped from the bar one at a time.
The original four-finger version of the bar was developed after a worker at the Rowntree’s factory in York put a suggestion in the suggestion box for a snack that a “man could have in his lunch box for work”. It was launched in September 1935 in the UK as Rowntree’s Chocolate Crisp (price: 2d). The two-finger version was launched on May 15, 1936. Rowntree’s Chocolate Crisp was renamed Kit Kat Chocolate Crisp in 1937, and after World War II just Kit Kat. The name is believed to have come from the Kit-Cat Club, an eighteenth-century political club for artists. In 1937, the Norwegian firm Freia launched a near-identical chocolate bar called Kvikk Lunsj for the Norwegian market.
The traditional bar has four fingers which each measure approximately 1 centimetre (0.39 in) by 9 centimetres (3.5 in). The Kit Kat Chunky (known as Big Kat in the U.S.) has one large finger approximately 2.5 centimetres (0.98 in) wide and was introduced in 1999. Kit Kat bars contain varying numbers of fingers depending on the market, ranging from the half-finger sized Kit Kat Petit in Japan to the three-fingered variants in Arabia to the twelve-finger Kit Kat family-size bars in Australia and France. Kit Kat bars are sold either individually or in bags, boxes or multi-packs. In the UK and Canada, Nestlé also produces a Kit Kat ice cream; and in Malaysia, Kit Kat Drumsticks.
Info gleaned from Wikipedia