It’s that moment at a Black party you either love or hate. Cameo’s Candy, one of the all-time great funk records, comes on and everyone lines up to do the dance. Maybe you throw yourself into it, maybe you are a white friend who looks around in confusion, or maybe, like me, you just sigh in resignation. The dance is a US import, beginning life as the electric slide in the mid-70s, and eventually becoming the Candy in Britain, thanks to its appearance at the end of the 1999 movie The Best Man.