I am also quite certain it pertains to the thread in Wordplay about Rodent and Rat related sayings. As we all know, mice though quite willing, have not managed to grasp the subtleties of English grammar and are generally, as such, wont to spell things phonetically. It doesn’t help that (and they should be pitied for this) they have a teeny tiny pointed mouths with lips that are none too mobile, so they do suffer with a bit of a lisp.

In 1958, after the inauguration of the current Mousal government (after the civil war between the country and city mice) a new polyseforse was established and every member has Polysemous printed up on his badge.

I’m sorry, I though everybody knew this.