Some 9,000 people who can't -- or won't -- pay delinquent medical bills are singing John Oliver's praises.

John Oliver arrives at the 3rd Annual LOL With LLS on May 23, 2016 in New York City. (Photo by Dave Kotinsky/Getty Images for The Leukemia & Lymphoma Society )

The HBO host illustrated a story about practices in a little known industry that purchases the records of people delinquent in bills and attempts to collect them by acquiring $15 million worth of unpaid medical bills. He got them for only $60,000, and immediately forgave the debts.

On his HBO show on Sunday night, Oliver claimed it was television's biggest giveaway since an Oprah Winfrey episode where the talk-show host gave cars to her television audience.

Oliver's show, "Last Week Tonight," engages in a form of investigative comedy, and showed the abuses of some of these companies who try to collect on debts.

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