On the one hand, people are happy to invent (and believe) all sorts of stories about the history of words and phrases (acronymic etymologies, which are hardly ever correct, are enormously popular). On the other hand, some real histories are quite remarkable, and once you’ve seen the details of some well-documented histories — bedlam, nice, silly, O.K. — you might be willing to swallow anything.
Here’s a small-scale example of surprising but true history: the verbs don and doff, as in this cattioned photo (photo by Benno Thoma, caption by me, cat by B. Kliban), from AZBlogX (where several sets of these have been posted; many are not X-rated, but few have linguistic interest, so they end up on my other blog):

The history in brief: from the late Middle English V + Prt verbs do on and do off.
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