Every time I catalog DVDs/VHS tapes, I learn something new, since this isn't a format I normally work with. For instance, I've learned a lot about how other libraries handle classification of fiction DVDs and videos. One of these days, especially if there are signs that our DVD collection will be growing significantly, it'd be nice to go over our DVD collection and reclassify anything that needs it (I could include our VHS collection, but I'm betting our DVD collection will be around longer).
I'm currently trying to be good about recording any classification decisions I've made, in the hopes that future classification efforts can be more consistent that they have been. Some things have been classified very oddly over the years, or there have been misunderstandings about the correct way to apply LC's classification schedule (understandable, since LC classification works best for non-fiction).