Songs of innocence. The author & printer W. Blake. [London] 1789. From the Lessing J. Rosenwald Collection in the Rare Book and Special Collections Division at the Library of Congress. For the full work see: http://hdl.loc.gov/loc.rbc/rosenwald.1797
Medieval monks complained about their jobs in the margins of ancient manuscripts
"Medieval monks were the bored data entry workers of their day, spending hours copying manuscripts in uncomfortable chairs and cold rooms. To keep themselves entertained, they often made little doodles or silly comments in the margins of manuscripts they were copying."