At my secondary school
They started putting up posters each week to give basic details of various forms of punctuation, commas, colons (hehehe) etc. I used to take them down and replace them with, initially, similar looking ones that were subtly different (i.e. wrong) but eventually just surreal. They stopped putting the posters up after that.

That was as close as we got to being taught grammar.
(Bazongaloid, Wed 2 Apr 2008, 12:30, Reply)