Go visit xkcd now, because I suspect it will be back to, ah, "normal" tomorrow.
Some cheats in the comments.
Update: The 2010 April Fools' Day xkcd hack will live on.
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vi (et al...)
shutdownsudo shutdownrebootrm, with selected operandsmanman helpman catwho
man nextclearAnd... There's a thread active on the xkcd forum