'It feels like I am falling. My eyes glaze slightly and my vision begins to blur and a freefall sensation takes over, very soon to be replaced by adrenalin jetting around my body. My heart pounds and sweat begins to pump out of my glands as my body tries to keep me upright. When this begins I know that I have to get myself horizontal as soon as possible no matter where I am. On tram floors, house party dance floors and litter-strewn footpaths, I plant myself down, and wait.' (Author's introduction)