I guess i should say PG-13
A lot of children are going to play this game … So I’d choose the third one. 
I agree with what conan said, partially at least the game would surely get an M-rating in the US just for the one “Fuck” in there 
I would leave that stuff out entirely just to be sure. We certainly do not want to kill markets with not really necessary additions to the game 
Some witty one by Daffy would do fine I guess.
They are awesome! but sadly probably can’t go in the game 
I knew that was coming but had to try. Just had to try and get one by the politically correctness board. Just a thought but maybe some day there will be a option to let you make you rooms more like home. I was thinking like two or three basic posters that we could just find and replace the image of.
In my drunken stupor i posted the wrong sign’s or the right ones depending on how you feel. Was originally thinking along this line.
I cant help my self
We used to have a sign in the workshops:
Basic labout price: £40 per hour
Price if you watch: £60 per hour
Price if you ‘help’: £80 per hour
Ahah! Gold, I want to post that on my door 
Come to think about it I want that on a shirt
Here’s some G-rated and not all car related but still hilarious signs.
http://www.just-whatever.com/wp-content/uploads/2008/03/funny_signs_05.jpg
The fire exit one would be funny over a door (duh) and the last one would be great if you put it over a dirty rag bin.
Just put one of those two and the game is complete 
http://cdn101.iofferphoto.com/img/item/878/512/41/A0RRaWqNT6HATiW.jpg