I seem to be one of very few people who think that pretending (in the imitative sense - to put it very loosely) poses a serious problem for the success of the private language argument. Cue much inexplicit argument with people who think I'm talking even more rubbish than usual. This one could run and run.
Here's a lucid piece by Paul Boghossian in the New Republic in 2001, on why pragmatism 'doesn't work in practice', to slightly misquote Sidney Morgenbesser.
UPDATE. a distressed liberal writes, Falluja pictures.