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Logging into the web page for my email account, I look up my password. (I don't usually have to remember it, as Thunderbird's Password Manager has it saved). And I wonder why did I ever set my password to *that*? There's no way I'd *ever* be able to remember it.
So I change it to something else that I'd at least have a chance of remembering, if I really wanted to.
Five minutes later I'm at the login screen of another site, whose password I usually have no trouble remembering. But due to me having used a particular word in the new password I set above, and due to this password also having contained that same word, I'm now completely flummoxed as to what the rest of this password was. So I end up having to look it up.
So I change it to something else that I'd at least have a chance of remembering, if I really wanted to.
Five minutes later I'm at the login screen of another site, whose password I usually have no trouble remembering. But due to me having used a particular word in the new password I set above, and due to this password also having contained that same word, I'm now completely flummoxed as to what the rest of this password was. So I end up having to look it up.