About forgetting or losing your eyeglasses in early modern Europe: Poor thing, have you lost your glasses again? Have you checked the book you were reading? Most often, when you forgot where you put your eyeglasses to, someone found them between the pages...
The history of reading had a chapter about forgetting eyeglasses in books, and about historians and librarians finding traces of these lost eyeglasses.
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Medieval cut-and-paste: the rubricator put the red and blue section number "XLVIII" in the wrong place, so the owner of the book cut it out and stuck it in the correct place, lower down the same margin:
(Oxford, University College, MS 55 https://medieval.bodleian.ox.ac.uk/catalog/manuscript_13037)
The secret to comedy is timing, and I just got the payoff to a hundred year old joke. I was listening to the Blank Check podcast on Buster Keaton, which mentioned that the title of his short “One Week” was a play on “Three Weeks” a scandalous 1907 erotic novel.
We have a novelty fake book called “Four Weeks: A Loud Book” with a cap gun mechanism inside, and when you open it, the cap fires. The joke is that you were trying to steal a look at a sexy book and got very dramatically caught.