I stumbled across this scattergun approach to apostrophes recently while wandering the gangland streets of south London.
Feel free to give this barber a call on the number below and explain the difference between a possessive noun and a plural.

Please excuse me while I switch to Alan Partridge mode:
‘Idea for a programme, Lynn: hard-hitting investigative docu-series starring professional bad bastard Ross Kemp, who uncovers the stark reality of misplaced apostrophes on the streets of the capital… this sobering series takes over where the news crews stop, delving deeper into the lives of apostrophe abusers and those forced to live in the midst of erroneous punctuation on London’s streets.’

Comment by JD (The Engine Room) — 2nd September, 2009 @ 10:36 pm