See the thing is that I'm not really sure there is a good reason. It was my freshmen year second semester, I had all other science classes (physics, bio, orgo). I thought the class would be relativevly easy but it turned out to be a lot more work than I expected, and I realized that a little too late when I reasoned that even if I got a 100% on the final (not possible) I would only have a B in the class. It was in Intl Relations, a field completely outside of my major or minor fields if that helps.....
gah I don't know whether to explain it as "young and foolish" or just ignore it? Although, I will probably be asked about it somewhere...