Paranormal challenges, often posed by groups or individuals who self-identify as skeptics or rationalists, publicly challenge those who claim to possess paranormal abilities to demonstrate that they in fact possess them, and are not fraudulent or self-deceptive.
The first medium to be tested was George Valiantine, who claimed that in his presence spirits would speak through a trumpet that floated around a darkened room.
Because the light signals were tripped during his performance - indicating that he did leave his seat multiple times, sometimes for up to eighteen seconds - Valiantine was confirmed to be a fraud, and did not collect the award money.
[2] Since then, many individuals and groups have offered similar monetary awards for proof of the paranormal in an observed setting.
In 2015, James Randi ceased to accept public applications directly from people claiming to have paranormal powers.