What Is the Thing Rattling Around in My Shoe?

I'm walking & something is rattling in the toe of my shoe. Based on what I've seen the kids playing with in close proximity to my shoe, here's what it could possibly be:
  1. A penny
  2. A pistachio
  3. A minion arm
    Kevin's to be exact.
  4. A plastic gem
  5. WHAT IT WAS
    A dime.