Related:

• Never try to teach a pig to sing. It's a waste of your time and annoys the pig. -- Anon.
• Never try to teach a pig to sing. It wastes your time and annoys the pig.
• You can lead a yak to water but you can't teach an old dog to make a silk purse out of a pig in a poke.
  -- Opu...
• If you think this fortune is confusing, then change one pig.
• A pig is a jolly companion, Boar, sow, barrow, or gilt -- A pig is a pal, who'll boost your morale, Though mountains may topple and tilt.
  When they've blackballed, bamboozled, and burned you, When they've turned on you, Tory and Whig, Though you may be thrown over by Tabby and Rover, You'll never go wrong with a pig, a pig, You'll never go wrong with a pig!...