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sage: r.library("fortunes")
sage: r.fortune("'WTFM'")

This is all documented in TFM. Those who WTFM don't want to have to WTFM again
on the mailing list. RTFM.
   -- Barry Rowlingson
      R-help (October 2003)

This won't give you a "ready-made" answer, but may point you in the right direction. In last resort, try the source code...