When I was at primary school, one of the things they did to keep us occupied was make us perform a strange, tuneless chant about a factory worker named Joe. ‘Hi!’ we would shout. ‘My name’s Joe! And I work in a button fac-tor-ee. One day, my boss came to me and said “Joe! Are you busy?” I said “No!”’ As the chant developed, poor Joe would be given more and more instructions. First it was ‘Push this button with you right hand!’ and we would have to jab our right index fingers rhythmically in the air while continuing to chant. Then it was the left hand, then the right foot, then the left foot, then the head. I don’t remember there being any natural stopping point. It just went on until we made mistakes, forgetting some of the ‘buttons’ or losing our balance and falling over.