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The descriptivist's dilemma
(discuss.tchncs.de)
spoiler
alt text: A two panel comic. In the first panel there are two buttons labeled "I don't believe in prescriptivism" and "'Literally' cannot mean 'figuratively'". A finger hovers between the buttons. In the second panel, the finger's owner is sweating and wiping his brow, unable to decide.
I think that should always have been a unique usage case, rather than a definition, though.