Why do the French call an April Fool a poisson d’avril and a 1 April dupe a victime d’un poisson d’avril? I have always assumed it is because the victimes take the bait and swallow the hook; but Martin Wainwright tells us that the April Fish derives its name from ‘the dim-witted, bulging look of carp’ — ‘the notion suits the bewildered look of a baffled hoax victim’. This side of the Channel we do refer to a ‘cod letter’, a genre in which I can claim a modest track record. Apparently on 1 April Frogs go round sticking paper fish on each others’ backs. How droll: if they had tried that on Quasimodo, he’d have been the Fishback of Nôtre Dame — high gudgeon amid the bells and corbels. And if you stuck 20 franc notes on someone instead of fish, I suppose he’d be a Cashback.

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