Here are a couple of weird Irish ones:

[Linked Image from chuckbrodsky.com]

and a safety message from the NRA (National Roads Authority... not the US Gun lobby!) ... obviously put up by drunken installers.. I mean HOW!? could anyone manage to do this?!

[Linked Image from castlebar.ie]

Click here for the full size version : http://www.castlebar.ie/photos/pj/MayosignsApr04web/dscf0045.jpg
[Linked Image from bamjam.net]