(http://i.telegraph.co.uk/telegraph/multimedia/archive/01249/zombies_1249941i.jpg)
Yeah, so don't leave your sign sitting by the side of the road with the access panel unlocked...
source: http://www.telegraph.co.uk/news/picturegalleries/pictures-of-the-year/6906216/Pictures-of-the-year-2009-funny.html?image=3 (http://www.telegraph.co.uk/news/picturegalleries/pictures-of-the-year/6906216/Pictures-of-the-year-2009-funny.html?image=3)
everybody grab your banjo...
(http://screenrant.com/wp-content/uploads/zombieland-banjo-570x710.jpg)
From what I understand some of those signs are programmed via unencrypted IR. Some can be set with nothing more than a universal remote with the correct codes loaded.
That's freakin' awesome!