This incident happened in Hungary. Hungarian Forint is quite weak in comparison to the euro (it isn’t easy math to do in your head).
When I was given a lot of change from a street hawker, it all seemed right. Only after I rushed out, I realized that the bills were of similar color but they handed me smaller bills for what should have been larger denominations.
It was a shock to me, as I’m not used to counting my change everytime.
Lesson learnt, always check and count your change.