Walking pens

I sometimes make notes in our living room.  I like to use ballpoint pens since the writing lasts long. Pencil lasts, too and I never find that it has smeared too much.  Still, I like pens.  I am surprised at how easily and unconsciously I can not only carry a note over to our office but how I can manage to bring the pen I used along with it, too.  Then, later, I want to make another note but no pen!  I had a pen but it managed to walk down the hall into the office. Durn pen!