Walking with Spirits

 is a Fallout 3 quest and achievement that is added to the game with the Point Lookout add-on. It is assumed that you will have to shave your head sometime during the add-on. Some time into this quest you will be drugged and you will halucinate and start seeing giant bobble heads. When the halucination is over you wake up with your head shaved and you will figure out that the tribals took part of your brain.