Annoyed Graphic Designer?
 

Check out this fake subway system advisory, not sure what network it's complaining about. A bit of a more guerilla warfare approach to complaining about service standards than the job done here...pretty funny though!http://img404.imageshack.us/img404/5...ayadvisory.jpg

classic

a slightly less in your face one here in Toronto - stickers on every subway station entrance show when you CAN'T bring a bike on. Someone designed an identical one but reversed the intent, indicating when you can.
http://urbanrepairs.blogspot.com/200...rs-by-urs.html

Its the New York subway I think

I have thought of doing that myself, be very funny