The weekend before Christmas I was doing some reading and research on the Trinity (which is what I spend most of my weekends doing), and I stumbled across something in a journal article that sounded very much like something I had read in a systematic theology book. So I opened the book to compare, and sure enough it was verbatim (the only difference being a single word missing the italics from the original source).
So I turned back to the article expecting to see that the author was quoting a large portion from the theology book and that I was simply reading somewhere in the middle of the quote, but I saw no quotation marks and no mention of the author’s work. Perplexed I started comparing further, wondering if perhaps this was just a very long extended quotation. To my shock I discovered the the author of the journal article had reproduced without quotation marks nearly verbatim (somewhere between 95% and 99% identical content) the entirety of his 24-page article from the other individual’s theology book—almost a complete copy and paste with just a handful of very minor cosmetic changes. The only credit he gave to the author of the content was a mention in his first footnote where he listed a few sources on the doctrine of the Trinity. At the end of the footnote, he mentioned his particular indebtedness to the author whose content he plagiarized. (Most readers have no idea how indebted he really was!)