Robert Joseph White's Pipe

Origin
Robert Joseph White was an accomplished neurosurgeon known for his controversial experiments with Rhesus monkeys, including one where he successfully grafted a live monkey head onto the body of another monkey.

Effects
It gives the user incredible knowledge & skill at neurosurgery but makes them more & more frightening to all forms of primates the more they use it. This might seem to be no big loss for such a big gain, but keep in mind that humans are simply the most highly developed primates in the world.