I have an algorithm for minimizing my coin count. When I buy a soda or snack from a machine, I put the smallest denomination coins in first (nickles) and then work my way up (dimes, then quarters) until I have put enough money in to make my purchase. The machine gives me change, and as long as the item costs at least 25 cents (a practical certainty!), I'm sure to have fewer coins in my pocket afterwards.