... was curious to see that when it was so narrow that one could almost jump it, the Arabs would still go for many hundreds of yards rather than risk the crossing. Then, with good, hard country before them once more, the tired beasts were whipped up, and they ambled on with a double-jointed jogtrot, which set the prisoners nodding and bowing in grotesque and ludicrous misery. It was fun at first, and they smiled at each other, but soon the fun had become tragedy as the terrible camel-ache seized them by spine and waist, with its deep, dull throb, which ... — The Tragedy of The Korosko • Arthur Conan Doyle