When I'm bored, I'll play with anything handy; a clicky pen, a stress ball, the clip on my keys, a USB drive, an ID or whistle lanyard, the plastic key clip on the bottom of my cell phone holster, etc. Ever try carrying around a squeeze toy or stress ball? You can get them for a couple dollars in most places, some companies give away ones with their logo. I tend to edc one because I work with special needs students who need fidget toys to stay calm/quiet, and I often find myself playing with it. I found a small one with an elastic lanyard here. I didn't realize it had the lanyard when I bought it, but it works great to swing the ball around or to keep it from dropping from your hand.