I was once doing so bad at a junior college calculus class that I went back to the first question (name) and changed my answer to Peter Gallagher. Needless to say, I wasn't going to pass that course, but at some point after not attending classes for a few weeks, I showed back up. The teacher came to be during the break and asked "Are you .... Peter?" I had to explain the situation. Apparently I had caused him a bunch of confusion as to why a Peter would come and take a test in a subject he was awful in.