<img src="https://techcrunch.com/wp-content/uploads/2007/01/passwords for helping out your friends when they've misplaced theirs, and not for logging into your neighbor's wireless and messing with their settings.
The prerequisites for the latter are 1) an open wireless connection, and 2) a real hatred for your neighbors. Just make sure they don't know it was you that locked them out of their router.
Default Password List [Phenoelit via Lifehacker]