Really? Can you give 3 examples please?
Ideally these examples do not defeat the purpose of a password and do not increase the risk of a password being leaked.
1) In application development it is common to have many services that have service accounts (not personal) that need to be authenticated against. A team will share passwords that need to be secure but shared between a select group of developers.
2) I want to give my girlfriend/mom/sister my Netflix password so she can log into her profile on my Netflix account
3) Husband & wife need to share passwords to log into Netflix/Youtube/Hulu on their iPad for their kids
4) Husband & wife have a shared account for bank/New York times/<insert desired service here>
5) Guy gives female friend his password to Match.com so she can write and run his profile to help hook him up (friend actually did this years ago)
Passwords should be secured but that does not mean it should never be shared.
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Alright, since nobody else has, I'll just drop this here. There's no real reason to make your password "BKtat8uW(aJb" unless you're already using a password manager and will never have to type it — or you just hate yourself.
If you're wanting or needing to remember passwords or relate them to other humans, you can make memorable ones that are just fine (source):
View attachment 765217
Use Diceware:
http://world.std.com/~reinhold/diceware.html
And here's an online Diceware generator using a more up-to-date word list from EFF:
https://www.rempe.us/diceware/#eff