3,000 years ago, a heavily armed 6ft 9in giant strode out from the ranks of the Philistine army each morning for 40 days and bellowed the same message to their Israelite opposition across the valley: “Choose a man and have him come down to me. If he is able to fight and kill me, we will become your subjects; but if I overcome him and kill him, you will become our subjects and serve us.”
Eventually on the 40th day, a young shepherd (who happened to be delivering food to his soldier brothers that morning) took him up on his challenge and stepped forward, armed only with five smooth stones and a sling.
The giant was Goliath and the boy was David. The rest is – quite literally – history.