In Vietnam you might hear this or some variation of it and it's not a joke nor is it nice to hear. In Vietnam, and maybe elsewhere in Asia or the world, people are real funny about money, literally the condition of cash. If you try to pay with cash that is not in good condition, for example it has a piece missing or is torn, many establishments will not accept it or will try very hard to get you to fork over some good cash instead.
This is one of my pet peeves about Vietnam because I find it to be so silly and such a waste of everyone's time. It's also an interesting study in conformist herd behavior.
Other than the government issued Vietnam dong (đồng, vnđ or vnd) the US dollar is still widely circulated and used in Vietnam. Many landlords who rent to foreigners request or demand rent payment in US dollars. It can be roundly debated how stable the US dollar is these days, but there is no doubt that it's many times more stable and reliable a store of value than the vnd.
In the case of US dollar cash, it's logical to be leary of bad cash because the nearest US bank that can recycle it is, well, kind of far away. During my first trip to Vietnam in 2008 I was rudely introduced to this when I went into a jewelry shop in Hanoi to change a $100 US bill into vnd and the lady wouldn't take it because it was a little worn.
I was a little taken aback at the time because the idea that cash has a certain lifespan and could become worth less as it physically disintegrates had simply never been something that I needed to think about. In the US as long as you have 51% or so of a bill you can send it or take it somewhere and have it replaced with a new one or so I've heard.
One of my housemates, another American, who pays the rent in US dollars has told me that some Vietnamese banks will accept worn US dollar cash, but they'll charge a fee to do it so it's easy to rationalize that worn foreign cash truly is worth less.
But here's where it gets silly. The Vietnamese also play the same game with their own vnd cash. Why they do this I don't know since Vietnamese cash, even torn or worn, is accepted at banks here. Or perhaps the banks also charge a fee to accept bad vnd cash.
I've seen vnd bills in denominations as low as 200 (less than 1 US cent) up to 500,000 (about $23.25 US). The bills in denominations under 10,000 are made of paper and tend to wear out rather quickly, but are still accepted in any condition since they're not worth very much. The denominations of 10,000 dong and higher are made of a high quality pliable plastic and will last much longer than paper and would be difficult and expensive to counterfeit. I've been told by a few sources that the Vietnamese cash is actually made in Australia and is similar to Aussie cash in composition.
I've only seen Vietnamese merchants balk at the condition of Vietnamese cash when it's at least 50,000 vnd ($2.33 US). This happened about 1 week ago when I was at one of the popular Pho24 restaurants and a foreigner at a table nearby paid with a 50,000 vnd note that the staff didn't like the condition of. He was very accommodating and happily took it back and gave the waitress a better one. How he eventually dispossessed himself of the mortally wounded note I wish I knew.
It took a long time for me to notice this game the Vietnamese play with their cash, but as is often the case, once I did notice it it became hard to ignore. Now I believe there's a game of hot potato that goes on and I believe foreigners are often a target since they rarely have any clue about it.
Most tourists in Vietnam exchange their cash for Vietnamese dong at an official foreign exchange counter. There are many of these scattered around Saigon and other tourist areas. I still obtain my dong the same way since I've found I get the best rates at the exchange counters around the high-end hotel area of District 1 along Dong Khoi (Đồng Khởi) and Nguyen Hue (Nguyễn Huệ) and Le Loi (Lê Lội) streets. This is one service that the Pham Ngu Lao (Phạm Ngũ Lão) backpacker area does not offer the best prices for. It's better to do your exchange in the large cities since rates start dropping as you move away from the competitive touristed areas.
Numerous times after exchanging a $100 US bill for a small stack of 100,000 vnd notes at one of the aforementioned official currency exchange counters, I've later discovered they slipped in a chipped or torn note. I'm trying to get myself into the habit of not only counting the cash when I do an exchange but also to look for any of these notes they might have inadvertently slipped in. By the way, I've never found any counting errors nor heard of any when exchanging cash this way. They're pretty good about that.
I've found the only way to get rid of a bad 100,000 vnd note is to force a merchant to accept it after I already owe the money such as when paying a restaurant bill. I actually go through a ridiculous process of separating my good cash from the bad in my pockets and after I pay with the bad note and they inevitably bring it back and ask if I have a good one, I pull out the small change from the staged pocket and tell them sorry I don't. That's what it takes to get rid of these 'bad' notes! I feel silly doing it, but I have no choice unless I want to either eat the $4.66 US every time I get one of these or take a trip to a bank to exchange it.
After a stay at a hotel in Nha Trang I paid the bill in US dollars and received change also in dollars and later discovered they had given me a really thin and torn $20 US bill. Luckily I hadn't left Nha Trang because I was only switching hotels so I took it back and the receptionist switched it for another no questions asked.
Before writing this post I found a badly chipped 20,000 dong (93 cents US) note in my possession and thought I would write about the difficult time I had passing it on, but at the Highlands Coffee shop I went to they took it without protest. This and my observation at Pho24 have led me to believe that 50,000 vnd is the generally accepted protest threshold.
You'd think we'd all have something better to spend our time on here.
On this trip to Vietnam, I've noticed a word that I didn't notice before that's used when expressing prices in vnd. Instead of saying the Vietnamese equivalent of 'twenty thousand dong' for example you'll hear 'hai (2) chục', so this word 'chục' means ten thousand dong. It sounds sort of like 'chup' in English. I consulted with a local and was told it's not a new word, but it's used informally in markets, etc. and you wouldn't use it in a more formal setting such as a bank.
If you're coming to Vietnam as a tourist and bringing cash with you, it's a very good idea to make sure it's all in good condition. If you want to make lots of friends here bring an abundant supply of crisp $1 and $2 (they love those here) US notes to hand out. You'll be welcome back any time.