Reverse thinking:

A man went to an ATM machine to withdraw money at night. Halfway through the operation, the machine broke down and the 10,000 yuan deduction was successful but no money was given out.

The man immediately contacted the bank customer service, who said they would record the situation but would have to wait until tomorrow to repair it. After the man hung up, he suddenly had an idea and called the customer service again. This time he said he came to withdraw money and the ATM machine gave out an extra 5,000 yuan. Five minutes later, the maintenance personnel arrived.