Valve's Portal 2 for the Sony PlayStation 3, Microsoft Xbox 360, PC, and Mac is loaded with hilarious and unusual warning signs, information guides, and motivational posters from different eras across the history of Aperture Science. Now you can browse the entire collection of signage and print out your favorites to display in your home and/or office. Yes, I think we can all have a lot of fun with these great warnings and notices. For instance, I've tacked this sign on the bulletin board used by the Environmental Health & Safety department in my office. Let's see how long it takes before somebody notices. Of course, the references are probably lost on most people if you work in an average office staffed with non-gamers, but like so much else in life, the right people will get the joke.