Re: Obligatory xkcd reference
To add to the XKCD example, I know of a few businesses using completely (for all intent and purpose) random very long string passwords for all their equipment. Passwords so long no human could ever remember them, so they are all written down on the doors of cupboards and the devices themselves.
Oh, your thinking it's ok as physical access is needed before someone gets that password? Well it's the pass to the public access internet wifi, so everyone else there has the pass written down so they can connect the countless devices needed for work, let alone to get some youtube vid at lunch time...
So the question is, why not just make it "opensaysme" as it would be just as effective...