At work we keep a list of all the relevant passwords. (In a safe place, mind you) When I was reading through I thought I read that the router login/pass was admin/password. Then I read it again. Yep, they decided to be "clever". The login was password and the password was admin.
Except it wasn't. Oh yeah, did I forget to mention that someone changed the password without mentioning what it was to anybody? The only way to fix it is to reboot the router, but work needs the network up 24/7 for the next several months.
In other news, I'm really earning my paycheck at this place.