If you have played the games in Valve's Left 4 Dead series you know that the zombie themed co-op shooter has messages written on the walls that are made by fictional survivors. Well, in the new expansion Left 4 Dead 2 The Passing it seems that a couple of those message have come from some alternate parallel game universes.

One of them, as spotted by Destroyed Controller, comes from Frank West, the photo-taking hero of Capcom's first Dead Rising game. Kotaku also reports another message left by "Crazy Dave" who is your neighbor and armorer in PopCap's fun casual game Plants Vs Zombies. It sound like both have found their way into Valve's zombieverse.