Did you know that if you insert a dollar bill into a vending machine and then insert extra coins before selecting your item, the vending machine will exchange your small coins for quarters?
I tried this on a whim when buying a pack of gum. At 60¢ for the gum, my 40¢ change would add to a pocket full of change. And I have an exhausting, never-ending need for quarters to pay for Metro parking every day since a day parked at a meter is cheaper than a day parked in the garage. Because the meters accept only quarters, I have an obsession that fosters creativity. So I put $1.10 into the machine and waited. I expected a quarter, two dimes, and a nickel to fall into the change slot. When I only heard two clinks, I did a mini mental dance.
The Evil Vending Machine Giver of Nickels and Dimes™ will never win again!