If you visit Indonesia and Thailand be careful about their money exchanger. There is some cunny money changer who people are very tricky when they count money by using fingers. I have exchanged 300 dollars in Indonesia. They have huge inflation, so it was very hard for me to count the money because they have million Rupia bank notes bit weird to hear but this is real.
However, that money changer didn’t use counting machine but his fingers. He was quite fast at counting. When I received half of the money I just counted but another half I didn’t. When I came back and counted again I found that he paid less than what I should get.
One of my Indonesian friends said sometimes it happens with the tourists, especially with the foreigners. I guess this is also a sort of scam.