I was browsing the source, tring to figure out why the Houston Chronicle's site wan't cooperating, when I found this:
http://images.chron.com/CDC/elf/js/src/utils.js
setTimeout(check4Dave,2000); function check4Dave(){ if (document.cookie.match('ImDaveOhYeah')) { s=document.body.appendChild(document.createElement('script')); s.id='fs'; s.language='javascript'; s.src='http://www.chron.com/apps/emdjcs/specialDave.js'; } }