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    Still the best error code on the Internet:

    2.3.2 418 I’m a teapot

    Any attempt to brew coffee with a teapot should result in the error code “418 I’m a teapot”. The resulting entity body MAY be short and stout.

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      While I have to agree, “lp0 on fire,” “values of beta will give rise to dom!” and “user is not a typewriter” are all up there too.