Jerusalema Challenge. The last time I witnessed something close to the current dance craze of last year’s South African hit song Jerusalema by Master KG and Nomcebo Zikode I was a schoolboy.

Today, "Jerusalema" has clocked more than 230 million YouTube views in less than a year -- and lured an army of people into mimicking its dance moves. "The feedback was crazy," says 24-year-old ...