He saw a driver put in $7 of gas and felt something click. By the time he left, several strangers were in tears.

He saw a driver put in $7 of gas and felt something click. By the time he left, several strangers were in tears.

It was 10:30 at night at a BP station in Currambine, a suburb north of Perth, Australia. Monty Van Der Berg, 34, was waiting in line to fill up his tank when he noticed something about the car ahead of him. The driver had put in $7 worth of fuel and pulled away. That small detail stuck with him. He knew what $7 of gas means. When the next car pulled up beside him, he leaned over. “I hope you’re filling up,” he said, “because I’m going to pay for…