“” http://itre.cis.upenn.edu/~myl/languagelog/archives/000350.html

• If Eskimos have N words for snow, X surely have Y words for Z.
• In space, no one can hear you X.
• X is the new Y.
• Once a(n) X, always a(n) X
  • semel X, semper X
  • X un jour, X toujours
  • einmal X, immer X
• One man's X is another man's Y
• What is this 'X' of which you speak?
• to X or not to X?

as seen in agoraphilia and the language log.