Graffiti

Graffiti is found all over the four campaigns of Left 4 Dead, most commonly so within the safe houses. The graffiti is left be survivors who had been through the area, generally messages for loved ones, to other survivors, or simple comments, such is the case with the infamous Chicago Ted.

Easter Eggs

 * Many of the dates of death used to say "-Person- May 2008". When 2009 arrived, the death dates changed from 2008 to 2009.

Notable Instances

 * "They are going to bomb the city. If you can read this, GET OUT!!!"
 * "Better safe than sorry." (Found in The Church.)
 * "I miss the internet." (Comment below an argument in Dead Air, the Terminal Safe House.)
 * "GOD IS DEAD" (Found throughout Dead Air)
 * "NO ZOMBIE IS SAFE FROM CHICAGO TED"