Mysterious Voodoo Skull

Changes into an Enigmatic Voodoo Skull for 20 hours after being used.
This skull can be used once each day, and gives you one out of 9 possible fortunes. The "Never say 'oops'. Always say 'ah, interesting!'" fortune is rarer than the others, it has a chance of around 0.2% of appearing. Several of these are popular phrases borrowed from elsewhere, such as the dragon line, which spoofs Tolkien's "Do not meddle in the affairs of wizards, for they are subtle and quick to anger." You will receive the achievement Superstitious upon having used Mysterious Voodoo Skulls 100 times (the message "It is not time yet." doesn't count).
It can be obtained from Shaggy Ogre Bags.

With update Update 9.83, the time you must wait for Enigmatic Voodoo Skulls to change back was reduced from 24 hours to 20 hours.