One day I read about plagiarism, I took a sentence from an article I had written and put it in quotes in Google Scholar. The result was not only my own paper, but there were two other hits: one was in another article and the other was in a book chapter. The authors, who were from Italy, had taken two of my paragraphs and also paragraphs from other authors and built a new article by stealing a paragraph here and a paragraph there.
By accident, I found in a PhD thesis not only plagiarized text, but also duplicated images. There were three photos and they were all the same, but one was mirrored, it was a mirror image but recognizable. I thought, I've seen this before. Then I switched from looking for plagiarized articles to looking for image duplication because it's faster.
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