"When setting out on a photographic holiday, always provide yourself with two cameras, one to leave in the train going and the other to leave in the cab coming back."

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I remember once going to see him [Ramanujan] when he was lying ill at Putney. I had ridden in taxi-cab No. 1729, and remarked that the number seemed to me rather a dull one, and that I hoped it was not an unfavourable omen. "No," he replied, "it is a very interesting number; it is the smallest number expressible as a sum of two cubes in two different ways."

— G. H. Hardy