Who got my pen?

I have a couple of pens I really like to use. They write well and I can even use them for carbonless copies when I need to since they allow me to bear down without squishing ink everywhere. Apparently, I left them laying around at work and now they're gone. Why is it that when someone finds ballpoint pens laying on a desk or counter, they think it's alright to take them? I think I'm going to have to get one on a leash and keep it clipped to my belt loop at work so it doesn't ever get away from me.

By the way, someone got my new click pencil, too.