Calaveras Skull

Origins
The Calaveras Skull was a human skull discovered in California that claimed humans lived alongside mastodons and elephants. The skull was found in a mine and made its way to a man named Josiah Whitney, who believed the theory mentioned. Its validity was immediately challenged, with tests showing it is more recent, about a thousand years old. Ironically, calaveras is a Spanish word for skull.

Effects
The skull did not posses any powers until all the gossip around it; activation is caused by ownership and staring into it. When a person says something, they will be refuted or not believed by others. Long term effects is the decay of common sense.