Speaking of nearly useless coins....the Turkish Kurus (which is pronounced kur-roosh) is a denomination worth 1/10 of a lira, which is their "dollar". So, in other words, the Turkish dime. There were 1, 5, 10, 20 and 50 Kurus coins.
I have a 1/100 Kurus, which is about the size of a small pea. What it's used for, I was told, is to reconcile official bank transactions when it comes to percentages. If a bank transfer or payment or whatever came out to 5,000,000.0003 Lira, nobody would say, "Oh, forget it, you can pick up the next one!" Oh, no, someone would have to dig in the bottom of the bag and fork over three 1/100 Kurus coins.
Sounds silly, but who am I to tell people how to do business?