Those who suffer from Bi-Polar disorder and have been through severe manic episodes of psychosis that crave mania because they loved how it made them feel. These folk have attempted or succeeded at purposefully stopped taking their medicine in order to induce a manic episode.
Me - "Dude, first I thought I was still dreaming, then I thought I was superhuman, then I thought I was Jesus Christ, then I thought that I could fly, then I thought that I was dead, then I watched TV in 3D. It was awesome. I am going to go off my bi-polar medicine and try to go manic again."