Just came across this National Post article on a new TTC etiquette campaign.   HILARIOUS!  You can see the posters here but click through to the article for links to print-ready versions.

See the article for print-ready versions: http://network.nationalpost.com/NP/blogs/toronto/archive/2010/04/23/a-ttc-etiquette-campaign-the-ttc-doesn-t-know-about-with-printable-posters.aspx