A human karaoke machine takes centre stage in the launch campaign for Kit Kat Caramel Chunky. The TV ad features a scruffy lad endlessly pointing out song lyrics to a group of girls singing along to the Pussycat Dolls until he finds brief respite with a Kit Kat. The ad hits screens this week for the Nestlé brand's ongoing Music Break promotion, which is part of a £24m marketing spend for Kit Kat in 2009.