alt Hacker News>>Actually, let me be more accurate: people who pay with credit card always tip in cash, as there is no way to tip with a credit card.
Eh? I don't know if you consider Poland eastern europe(I don't really), but I tip with a card all the time in Poland, you just ask "hey can I leave a tip on the card" and they bump up the amount by whatever you want to tip. And no, the amount doesn't then equal what's on the receipt - I don't know how they work it out internally, but frankly that's not my problem.
I tried tipping with card, and they told me that they can't "bump it up" (as in, they will get in trouble if they do). I suppose it depends on the place. I know for a fact that you can't tip with a credit card for parcel couriers. What I do not know for a fact is restaurants. So I suppose it varies. You tip doctors with cash, too. It is illegal to do so, but people do it and doctors expect it, it is just done more discretely.
I was not referring to Poland, but Hungary. What gave you the idea that I was referring to Poland? :P FWIW, I do speak Polish though, and I have many Polish friends.