Example:

According to reports from the British "Daily Telegraph" and other media on the 8th, on the morning of the 5th of this month, a family in Polk County, Davenport, Iowa, USA Community college student Harun Maggard accidentally lost his credit card. After careful recall, he concluded that the card was lost in a public parking lot in the city. Harun immediately called to report the loss. However, he was told by the credit card company operator that his card had been used to purchase a pizza just minutes earlier. Harlan also learned that the pizzeria was near the Shajing Road parking lot.

Based on the card swiping time provided by the operator, Harlan concluded that the person who used his card to buy pizza was probably still in the same restaurant, so he immediately called the police. Following the clues provided by Harlan, the Polk County police caught the card thief Richard Lewis Liudin who was waiting for pizza in the store.

It turned out that Harlan’s credit card was picked up in the parking lot by Liu Ding, who was about to go out for dinner that day. Since no one was paying attention at the time, the card still had the signature of the cardholder. Liu Ding picked up the card after picking it up. Ding conveniently put the card into his pocket and planned to take the opportunity to have a feast. Thinking that no one noticed, Liudin then went to a nearby restaurant and ordered two large pizzas and an olive oil, and paid the bill of $40.64 with Harlan's credit card. Liu Ding also imitated the signature handwriting on the card and signed the bill for confirmation. Liu Ding thought that everything was done discreetly and he got a small advantage, but he didn't want to be dragged into the police station before he could enjoy this "free lunch".

According to the police, 54-year-old Liu Ding is a dentist in Oakmouth, Michigan, USA. Liu Ding had at least US$250 in cash with him at the time, which was enough to pay the bill. In addition, Liu Ding himself is not short of money, with assets of at least US$4 million. Currently waiting for him are multiple prosecutions for credit card theft and forged signatures.