The last thing I plagiarized was a fifth grade paper on birds and flight. I'd procrastinated writing it and had to do it early the morning it was due. I didn't copy word-for-word out of the encyclopedia, but I did copy some concepts I didn't completely understand, without taking the time to actually understand them. I was caught when my parents, who asked to read the paper, were pretty sure I didn't know what "sinews" were.
Among the things I regret about that episode are that I made my parents explain the pitfalls of intellectual dishonesty while groggy and in bed and still drinking their first cup of coffee.