| This might be|
|But we're not sure|
Stuart Landsborough is a New Zealand born skeptic who started the New Zealand Psychic Challenge. Stuart Landsborough buried $50,000 worth of New Zealand promissory notes within 5km of the Puzzling World Theme Park he built and offered it to any psychic who could find it. After six months he made it easier by burying the notes within a 200 metre radius. Four people (seven, according to Wikipedia) have tried and failed to find the loot.
In 2006 the money was moved again, to within 100 metres of his premises, and he upped the ante by another $50,000 -- however, no "true psychic" would accept the challenge for money despite Landsborough saying he would donate the money to a charity of the psychic's choice.