Recently on Last Week Tonight, John Oliver bought $US15 million ($20 million) in outstanding medical debt just to prove how easy it is to start a debt buying company. It was debt that regular people owed, presumably from surgeries, hospital stays, medical procedures and so on. Instead of buying the debt to turn a profit, Oliver forgave it. All of it. The segment outlined the many flaws of the debt and credit industry, but specifically the concept of "zombie debt", or old, forgotten debt that somehow resurfaces.