Here's a snippet I usually share when it comes to pocket pieces about my own habits:
I actually carry two pocket pieces on me at any given time, and each of them has their own purpose.

The first I call "Morgan" and, yes it's the most obvious reason: She is a 1903-CC
Morgan dollar.
Yes, I said that right. A
1903-CC Morgan Dollar.
She's a counterfeit. Sticks to a magnet like glue. :-)
Why do I carry around Phoney Morgan? Well, when you're a counterfeit collector, it's always fun to have a piece on you to test the water with. She's great to take to coin shows and get double-takes from and even sometimes fool a dealer or two. It's a really good way to test someone's numismatic mettle (i.e. see how long it takes them to figure out she's fake). Some people look at the year and mint mark and go "You're pulling my leg." Others have to sort through the Gray Sheet and scratch their chin when they don't find her. Some people have even grabbed her with magnets off the bat (and I must say that I was impressed).

The second pocket piece I carry around I call "Simon" and that's because he's a 1929 Venezuelan 5 Bolivares. I've always loved Barre's engravings, and he really did Simon Bolivar justice on this coin (although it's not as apparent on my Simon here, he's well worn). :-)
Why do I carry him? Well, three reasons really:
First, he's made of silver. A little silver in your pocket is good luck they say.
Second, where he was designed in Paris, France, he was minted here in the US in Philadelphia for Venezuela in the year of the Great Stock Market Crash. Because of that, he reminds me that even during tough times you need to keep in step with your obligations, no matter where they are.
Third, whenever I'm stuck for a choice and can't make up my mind, I give him a flip.
Illustration:
"Hmm... burger or pizza? *Flip---*
Simon says pizza." :-)