Where Did That Come From?

Have you ever pulled something out of your pocket and had no recollection of putting it there? I just pulled a black pen out of my pants pocket. I find this odd for the following reasons.

1. I pulled these pants fresh out of the closet this morning. They went into the closet after the last time I did laundry. I do not recall ruining an entire load of laundry with ink stains.
2. I tend to use blue pens for some reason. It's a strange preference. The lack of black pens in my immediate vicinity makes it doublely perplexing where this one came from.
3. I'm pretty sure this pen wasn't in my pocket when I got dressed. Which means that the mystery pen entered my pocket some time in the last 5 hours.
4. Also, I have been in the office all day so I haven't had a real good reason, nor an oppurtunity, to walk around with a pen in my pocket.

Strange. Either I have been visited by the pen fairy, or I suffer from unconscious cleptomania and shouldn't be trusted around office supplies.