Another voluntary subculture having a very heavy overlap with hackerdom; most hackers read SF and/or fantasy fiction avidly, and many go to ‘cons’ (SF conventions) or are involved in fandom-connected activities such as the Society for Creative Anachronism. Some hacker jargon originated in SF fandom; see defenestration, great-wall, cyberpunk, h, ha ha only serious, IMHO, mundane, neep-neep, Real Soon Now. Additionally, the jargon terms cowboy, cyberspace, de-rezz, go flatline, ice, phage, virus, wetware, wirehead, and worm originated in SF stories.