Signs that were placed prior to 1.8 have all been messed up in some form or another.

The random code for a ' in he sign text...
http://i.gyazo.com/706bbbe1086000c3c207271c42b9c5ab.png
http://i.gyazo.com/3782e2560638a0c540a0371c95924d7a.png

Lets add " to as much as we can
http://i.gyazo.com/d4d11f6b5f85e1a14c238f0617ea8d86.png
http://i.gyazo.com/4916f512d22fddf444ecce7710955f0c.png
http://i.gyazo.com/56056cbd0030b6e7de0ddd324dca387d.png

This is quite funny yet painful at my spawn as there would be more then 100 signs to rewrite