Fraud: Credit cards.

When I was in Los Angeles with my dad once many years ago, he tried to buy some chocolates at the airport but his card was declined. The cashier told him that a message appeared on the machine that he was to call the card centre. My dad was puzzled since he promptly paid his credit card bills each month.

Anyway, he called the card centre using his ICC at a public phone booth. In case you are wondering what on earth is an ICC, it was an International Calling Card issued by Singtel for people who were travelling overseas in the past. I don't think ICC exists now.

The card centre lady asked him where he was and told him his credit card was used in a petrol station in Johor just two hours ago! Wow! My dad must have had taken something faster than the Concord to travel from the USA to Johor and then back in two hours.

There are risky places to use credit cards and we have to be very careful:

Flea MarketsFlea market merchants are often transient and can be difficult to locate if there is a problem with charges. It's especially true for vendors who don't have online credit card terminals and instead make carbon copies of your credit card.

That doesn't mean those vendors are necessarily fraudulent, but it makes the transaction less secure. The credit card company might have trouble doing a charge back. If you're going to the flea market, take cash. It's also easier to negotiate that way.

Small Shops/Cafes in Foreign Countries
These smaller merchants have a significantly higher percentage of credit card fraud as reported by large banks and credit card companies. Many of these transactions end up being written off by the banks because the merchants simply can't be located. There's just a higher chance of fraud when you get outside of the mainstream, so when in doubt, use cash.

For the full article, read:
The Riskiest Places to Use Your Credit Card