Twenty years ago, the Euro became a reality in Leiden. After the introduction of the coin in '99, the guilder was still accepted in the first years, but since 2002 the guilder became ancient history. "DING FLOF BIPS", a mnemonic device used to remember which countries initially joined the Eurozone, became a trending topic, and the employees at the mint worked overtime to provide everyone with the new currency. The Dutch gulden and the geeltje became coins and notes of the past. Today, the very first day of 2022 is about numismatics (the study of coins), disappearing cash, the rise of plastic money, and the future of the Euro. In short, the versatile story behind those coins jingling around in your wallet and piggy bank.