When I was in college, in a network programming class we had a semester final coding assignment. I forget now what all it was supposed to do, but I do recall my friend in the same class spent a week of free time writing his. I forgot about the assignment completely until he asked me how it was going for me a few hours before it was due. With no other options, I simply punched in a example program from the textbook, replaced about 10 lines in the middle and tested.

It seemed to work. So, I very clearly labeled which code was mine, and which was copied, so that I technically wasn't doing a plagiarism. Then I turned it in, and hoped for the best. I got a 100 on it. My friend was pissed, because he only got a 99.