Not to take away from these legit ones, but it surprises me that some of the recent plagiarism cases included people who plagiarized their acknowledgements. Like really?
My housemate during our honours year had large portions of his thesis plagarised by the student who took over his work afterwards. We were surprised to discover that of all the lifted sections it was the acknowledgements that had the highest proportion of copying! I found this doubly funny because, compared to the adroit technical writing in the rest of the thesis, my friend's acknowledgement seemed florid and overwritten to me. It's a truly fascinating phenomenon.