'Oprah's Big Give' contestant Kim at the gas station.

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Kim heads straight for a gas station, where she treats every customer to a full tank of gas. "I hate to pay for gas," Kim says. "So I thought I would take care of everybody's gas and get them fun stuff from the convenience store." In 10 minutes, she spends $2,000.

"This challenge was tailor-made for me," Kim says. "It's going to be the brightest I've shined so far."