Source: a Marconi installation engineer told me this in 1960 and I haven't heard it since unless I've told it. ----- A rather posh lady is showing her small daughter around Rome in the back of a taxi. They pass a railway station and the daughter asks: "Mummy, what are all those ladies doing standing around in very short dresses?". The mother realises that she is referring to the prostitute day shift, but hedges - "I expect they are waiting for their friends, or looking at the Roman architecture, dear". The taxi driver flips back the partition and says: "Go on, a-mother. Tell her they're prostitutes!". "Mummy what are 'prostitutes'?" With a sigh, Mother tells all. The little girl is very interested: "But Mummy, don't they sometimes have babies?". "Well yes dear, I'm afraid they do." "But Mummy, what happens to the babies?". "Well dear, that's the interesting thing about it: invariably they become taxi-drivers".
(From the "Rest" of RHF)