  As I age, I remember less and less. Its not a short/long term memory thing, either. I just can't remember anything. As a result, every year I "keep track" of more and more things. It started off in 2000, when I decided to keep a list of every book I read, in chronological order. Now, in 2004, I keep similar lists for movies I watch and music I buy, again, in chronological order. It starts off with the best of intentions. I make a "Top Ten" list for CDs every year, and every December I have trouble keeping track of everything I've bought and/or listened to in the previous twelve months.
As a result, I always end up forgetting to include at least one CD that I really loved, but assumed was from the previous year. I always say I'll keep a list. Now, I do. Movies are another thing. I consider myself to have pretty good taste in a lot of different elements of culture--except movies. I love movies. I love most movies. So, I'll watch just about anything--and usually like it. I'll walk out of seeing something like Shallow Hal or The Majestic and proclaim to my movie companion how great/funny/moving/engaging/insightful/challenging it was.
Since I am so easy to please, I see a ton of movies. That, coupled with the fact I'm so dense I can't even remember my parents' names, when someone asks if I've seen a movie, I often can't remember. They'll describe the plot and I can't remember. Sometimes I've even rented movies, watched fifteen minutes of it, then suddenly realized I saw it in the theater six months ago. Thus, now, I keep a list to help recall what I've seen. When Miss Kitten heard of this latest list addition, she had a look of horror on her face.
I think she is constantly worried that I am one chronicled list or unique habit away from becoming Ted Kacynski or one of those guys you see on the news who keeps a detailed diary of everything they do and weighs (then chronicles) everything the eat. Of course I think that will never happen, but I have to admit, it isn't an irrational fear. It isn't like I'm going to make fewer lists each year. And if the list-making thing works out, wouldn't it be logical that I'd try a few more? However, when I start making lists of my lists--then we have a problem. 
