We change up our theme every year, but use a few common characters and places form time to time. One of our old chestnuts is Pandora Labs, often the cause of every zombie invasion / mutation / general apocalypse disaster we cook up. This year we added some corporate commercials to add some fun - and we got a couple of requests via the website to learn more about our genetics company. Clearly, these people don't read the fine print.
The faux company website: http://www.darkhollowhaunt.com/pandora_mainsite.html