The Monkey's Paw is a famous fictional artefact from a horror story of the same name, it is a cursed-talisman created from the paw of a dead monkey and has the power to grant it's user three wishes - however the wishes come at a terrible cost for interfering with fate and the moral of "be careful what you wish for" is heavily used, as the Monkey's Paw will grant a wish but twist it so the outcome is horrific rather than rewarding (for example the user wishes for $200 - so the Monkey's Paw causes his son to die in an accident, giving him $200 in compensation).