My older son once copied a book report verbatim from Cliff Notes. He got an A. Our next-door neighbor, a year behind in school, copied my son's book report when he reached that class. Also got an A. My younger son, one year behind the neighbor, copied his book report. Got an F.
Teacher accused him of copying from Cliff Notes. He denied it. She showed him his work next to the Cliff Notes. Word for word. He realized what had happened and made a full confession: I copied from neighbor who copied it from brother who copied it from Cliff Notes. Still got an F, but the teacher got a funny story to tell. She was still telling it four years later when my daughter took the class. She proudly commented, "That's my brother." It also made for a very funny best man's toast.
that is hilarious!